Which neighboring requirement changed between OSPFv2 and OSPFv3?

A) Neighbors don't need to use the same hello and dead timers.
B) Neighbors don't need to use the same process-ID.
C) Neighbors don't need to be in the same subnet.
D) Neighbors don't need to be in the same area.

C
Explanation: C) The only major neighborship requirement that changed between OSPF versions is the fact that neighbors no longer need to be in the same IPv6 subnet.