What number is a valid representation for the 200F:0000:0000:AB00:0000:0000:0000:0000/56 IPv6 prefix?

What number is a valid representation for the 200F:0000:0000:AB00:0000:0000:0000:0000/56
IPv6 prefix?

A.
200F:0:0:AB/56

B.
200F::AB00/56

C.
200F:0:0:AB00::/56

D.
200F::AB/56