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A helper is a JavaScript resource that contains functions that can be reused by the component’s controller or other helpers. A controller is a JavaScript resource that contains functions that handle user interactions and events in the component. A renderer is a JavaScript resource that overrides the default rendering behavior of the component. A style is a CSS resource that defines the appearance of the component. A design is an XML resource that specifies the design-time attributes for the component. References: Using JavaScript, Using External JavaScript Libraries In Aura Component, Expression Functions Reference

The correct answer is option C. In Salesforce, a custom SOAP Web Service is defined using Apex with annotations that enable classes and methods to be exposed as web service endpoints. Helper methods that are not used by the Web Application should not be declared as webservice. They can be private or public but should not have the webservice keyword in their declaration. The webservice keyword is specifically for methods that are exposed to external applications via SOAP API.

References: The information can be referenced from the official Salesforce documentation on creating custom web services with Apex: Creating Custom Web Services.

Declarative development is the process of configuring and customizing the Salesforce platform using its built-in tools, such as the setup menu, without writing any code. Declarative development has the following advantages over programmatic customization, which involves writing custom code using Apex, Visualforce, or other languages:

• Declarative development can be done by anyone who knows how to use the Salesforce user interface, without requiring any programming knowledge or skills. Programmatic customization requires a skilled developer who knows how to write, test, and debug code.
• Declarative development does not require Apex test classes, which are mandatory for deploying any custom code to production. Apex test classes are used to verify the functionality and quality of the code, and to ensure that it meets the code coverage requirement of at least 75%. Declarative development does not have this requirement, as the platform automatically validates the configuration and customization.
• Declarative development is faster and easier to implement, as it involves clicking and dragging components, setting properties, and defining rules. Programmatic customization is more time-consuming and complex, as it involves writing lines of code, using development tools, and following coding standards and best practices.

However, declarative development also has some limitations and disadvantages compared to programmatic customization, such as:

• Declarative development has lower design limits and query limits than programmatic customization. Design limits are the maximum number of components, fields, objects, rules, etc. that can be used in a Salesforce org. Query limits are the maximum number of records that can be retrieved or manipulated in a single transaction. Programmatic customization can bypass some of these limits by using techniques such as dynamic SOQL, batch Apex, or asynchronous Apex.
• Declarative development has less flexibility and control over the functionality and user interface than programmatic customization. Programmatic customization can create custom logic, automation, integration, and user interface that are not possible or supported by the declarative tools. For example, programmatic customization can use Apex triggers to execute logic before or after a record is inserted, updated, deleted, or undeleted, while declarative development can only use workflow rules or process builder to execute logic after a record is created or updated.
• Declarative development can become difficult to maintain and troubleshoot as the complexity and number of components, rules, and dependencies increase. Programmatic customization can be more organized and modular, as it can use classes, methods, variables, comments, and annotations to structure and document the code.

Therefore, the best practice is to use a combination of declarative and programmatic development, depending on the use case and the requirements. The general rule of thumb is to use declarative development whenever possible, and use programmatic customization only when necessary or when it provides significant benefits.

References:

• Programmatic vs Declarative: Are Clicks Better Than Code?
• Clicks Not Code: Benefits of Declarative Vs. Imperative Programming
• Review Developer Fundamentals Unit

The view state limit is the maximum size of the serialized version of the page state that can be transferred between the server and the client. The view state includes the components, field values, and controller state of the page. To reduce the view state size, a developer can use a StandardSetController, which allows the developer to create pagination for a set of records without having to manually manage the query and the results. A StandardSetController can handle up to 10,000 records, and only the records that are displayed on the current page are included in the view state. This way, the developer can avoid querying and storing all the records in a list variable, which would increase the view state size and potentially cause errors. References:

• Visualforce Developer Guide: StandardSetController Methods
• Visualforce Developer Guide: Working with Very Large SOQL Queries
• Trailhead: Visualforce Basics

The exception type that cannot be caught is the LimitException. This exception is thrown when some governor limit is exceeded (like SOQL query limits, number of records that can be processed in a transaction, etc.). Salesforce doesn’t allow developers to catch LimitException in order to maintain the multi-tenant environment and ensure that no single tenant consumes excessive resources. References: Exception Class and Built-In Exceptions, Free Salesforce Platform Developer 1 Practice Exam (With Answers), SALESFORCE CERTIFIED PLATFORM DEVELOPER I