7. To extend an abstract class, a class must:

A. implement all abstract methods in the abstract class. (My answer)

B. implement at least one abstract method from the abstract class.

C include new methods.

D. specify the keyword implements

E. specify the keyword extends. (Correct answer)

Why is E the Correct answer

20. What is the purpose of the keyword this?

A. It allows you to instantiate an object and not give it a name. (my answer)

B. It allows you to instantiate an object when the class does not provide a constructor.

C. It allows a method in a class to pass a reference to the object currently represented by that class to a method in another class. (correct answer)

D. It is the mechanism by which polymorphism is implemented.

E. It allows you to extend an abstract class.

Why Is C the correct answer