You have both IPv4 and IPv6 running in your network. You are asked to migrate your IGP from ISIS to OSPF. The network must retain OSPF connectivity between all routers.
Which statement is correct?

A.
You must use OSPFv2 on all your routers.

B.
You must use OSPFv3 on all your routers.

C.
You must use OSPFv4 on all your routers.

D.
IPv6 routers must continue to use IS-IS.