On the Cisco IOS XR router, you have noticed lately that OSPF adjacency on one interface is flapping occasionally; three flaps in the last 5 hours. The log in each of the three flap cases has an error message showing that the OSPF state changed from EXCHANGE to DOWN with the description "Neighbor Down: dead timer expired." What is the most likely cause for this problem?
The CPU on the adjacent router is pegged at 100%.
The RP CPU on the Cisco IOS XR router is pegged at 100%.
The adjacent router is sending corrupted OSPF packets.
There is a routing loop between the Cisco IOS XR router and the adjacent router.
The link between the Cisco IOS XR and the adjacent router is severely degraded
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