Refer to the exhibit.

Which statement is true?

A.
IS-IS has been enabled on R4 for IPv6, single-topology.

B.
IS-IS has been enabled on R4 for IPv6, multitopology.

C.
IS-IS has been enabled on R4 for IPv6, single-topology and multitopology.

D.
R4 advertises IPv6 prefixes, but it does not forward IPv6 traffic, because the protocol has not
been enabled under router IS-IS.