Which of the following statement is true? | JAVA JSP

     A.    "X extends Y" is correct if and only if X is a class and Y is an interface
     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 if X and Y are either both classes or both interfaces
     D.    "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces.

Ans: C