OSPFv1 (B): Was an experimental version, not widely used.
OSPFv2 (C): Used for IPv4 networks, does not support IPv6.
OSPFv3 (D): Specifically designed for IPv6 networks and includes additional features like security and address scope handling.
OSPFv4 (A): This version does not exist.
Thus, the correct answer is D (OSPFv3).
[Reference: HCIA-Datacom Study Guide, OSPF for IPv6 Section., , , , ]
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