6.16.Questions6.16.1.X extends Y is correct if and only if X is a class and Y is an interface(True/False)6.16.2.Answer: interface extends6.16.3.X extends Y is correct if and only if X is an interface and Y is a class(True/False)6.16.4.Answer: class and interface6.16.5.X extends Y is correct if X and Y are either both classes or both interfaces(True/False)6.16.6.Answer: interface hierarchy6.1