Keywords for Defining Constants: static and final

C.

The correct answer is C. static and final.

In Apex, constants are declared using the "static" and "final" keywords.

The "static" keyword indicates that the constant belongs to the class and not to an instance of the class. This means that the constant can be accessed without creating an object of the class.

The "final" keyword indicates that the value of the constant cannot be changed once it has been assigned.

Together, "static" and "final" define a constant value that can be accessed from any part of the class or application.

Here's an example of how to define a constant in Apex:

javaCopy code
public class MyClass {     public static final Integer MY_CONSTANT = 42; } 

In this example, "MY_CONSTANT" is a public constant that belongs to the "MyClass" class. It has been assigned the value of 42, which cannot be changed because it is declared as "final". The "public" keyword indicates that the constant can be accessed from other classes in the application.

It's important to note that constants are typically named using all uppercase letters, with underscores to separate words (e.g. MY_CONSTANT). This naming convention makes it clear that the value is a constant and not a variable that can be changed.

So in summary, to define a constant in Apex, you should use the "static" and "final" keywords.