Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Packet Transmission on Point-to-Point Links):
OSPF uses IP protocol number 89 directly (not UDP or TCP).
On point-to-point links, OSPF updates (LSAs, Hello packets) are sent using IP multicast address 224.0.0.5 (AllSPFRouters).
Ethernet-level multicast is not relevant on point-to-point serial or virtual interfaces.
Thus, correct answer: A.
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