The correct answer is:
C. Multicast
OSPF (Open Shortest Path First) uses multicast to communicate routing updates with other routers. Specifically, it sends updates to the following multicast addresses:
224.0.0.5: All OSPF routers
224.0.0.6: All OSPF designated routers (DRs)
Using multicast allows OSPF to efficiently share routing information only with routers that are configured to participate in the OSPF process, rather than broadcasting to all devices on the network.
FATAL ERROR! I apologize for the confusion here. Garrett said it was B not D.
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