Given:

Which two classes use the shape class correctly?

Given:
Which two classes use the shape class correctly?
When deriving a non-abstract subclass from an abstract class, the subclass must provide implementations for all abstract methods inherited from the abstract class. In this case, the class Circle needs to provide an implementation for the abstract method draw() from the Shape class. Therefore, Option E is correct because it extends Shape and provides an implementation for draw(). Additionally, if a subclass does not provide implementations for all abstract methods, it must also be declared abstract to be valid. This is the case in Option B. Hence, Options B and E use the Shape class correctly.
Also, to add, you cannot implement an abstract class, only interfaces can be implemented.