What statement is true?

A.
L2TPv2 and L2TPv3 are the same protocol with enhanced features in L2TPv3.

B.
L2TPv2 and L2TPv3 are both commonly used for dial-in services.

C.
L2TPv2, not L2TPv3, is commonly used for dial-in services.

D.
L2TPv3 is used for Layer2 attachment services.

E.
None of the above