Which three options are valid IPv6 addresses?

Which three options are valid IPv6 addresses? (Choose three.)

A.
2001:db8:0:0

B.
2001:db8:0:6657:0:0:5687

C.
2001:db8:cdef::

D.
2001:0db8::3def:0000::9985

E.
2001:db8:abcd:33:9876:0:fe09:3225

F.
::3