Which two statements are true?

A.
An abstract class can implement an interface.

B.
An abstract class can be extended by an interface.

C.
An interface CANNOT be extended by another interface.

D.
An interface can be extended by an abstract class.

E.
An abstract class can be extended by a concrete class.

F.
An abstract class CANNOT be extended by an abstract class.

Explanation:
Reference: http://docs.oracle.com/javase/tutorial/java/IandI/abstract.html