Which solution should be implemented to prevent OSPF adjacency flapping if the primary routing processor fails?

A CRS router that runs Cisco IOS XR has dual routing processors installed. Which solution should be implemented to prevent OSPF adjacency flapping if the primary routing processor fails?
A. NSR
B. OSPF Fast Timers
C. OSPF RE Sync
D. router msdp
E. NSF

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