Which option is a valid IPv6 address?

Which option is a valid IPv6 address?

A.
2001:0000:130F::099a::12a

B.
2002:7654:A1AD:61:81AF:CCC1

C.
FEC0:ABCD:WXYZ:0067::2A4

D.
2004:1:25A4:886F::1