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Question
Which is true?
Options:
A .  "X extends Y" is correct if X and Y are either both classes or both interfaces
B .  "X extends Y" is correct if and only if X is an interface and Y is a class
C .  "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces
D .  "X extends Y" is correct if and only if X is a class and Y is an interface
Answer: Option A

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