Which of the following is correct?

A ''X extendds 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 calss.

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.

Correct Answer: Option C