Which three addresses are valid forms of an IPv6 Address: 2001:0DB8:0000:FE01:0000:0000:0000:0000?

Which three addresses are valid forms of an IPv6 Address:
2001:0DB8:0000:FE01:0000:0000:0000:0000? (Choose three.)

A.
2001:0DB8:0000:FE01::

B.
2001:DB8:0:FE01::

C.
2001:0DB8::FE01::

D.
2001:DB8:0:FE01:0:0:0:0