Question: 9. Suppose an abstract class implements an Interface. Where must that interface's methods be implemented? Select one: a. In the abstract class b. In all

9. Suppose an abstract class implements an Interface. Where must that interface's methods be implemented? Select one: a. In the abstract class b. In all the abstract class's direct, non-abstract sub classes c. In at least one of the abstract class's direct, non-abstract sub classes d. In all of the abstract class's descendant, non-abstract classes e. In at least one of the abstract class's descendant, non-abstract classes

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