Static Methods and Attributes

D.

In Apex programming language, static methods and attributes can be accessed through the class itself, which is option D.

Static methods and attributes are declared using the static keyword and they are associated with the class, rather than with any instance of the class. This means that they can be accessed without creating an instance of the class.

To access a static method or attribute, you simply use the name of the class followed by a dot (.), and then the name of the static method or attribute. For example, suppose you have a class called MyClass with a static method called myStaticMethod. You can call this method by using the following syntax:

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MyClass.myStaticMethod(); 

Similarly, you can access a static attribute of the class using the same syntax. For example, suppose you have a static attribute called myStaticAttribute in the MyClass class. You can access this attribute using the following syntax:

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MyClass.myStaticAttribute; 

Therefore, option D is the correct answer because static methods and attributes are accessed through the class itself, using the class name followed by a dot. Option A (Map, List, Set), B (Class, trigger), and C (Apex classes) are incorrect because they do not accurately describe how static methods and attributes are accessed in Apex.