What are two valid IPv6 addresses?

What are two valid IPv6 addresses? (Choose two.)

A.
2bfc::2 ::fe c:5c

B.
2bfc:2 :0:0:fe c:5c

C.
2bfc:0:0:2 ::fe c:5c

D.
2bfc::02 :0:0:fe c:5c