What must an OSPF router do when it receives a link state update?

What must an OSPF router do when it receives a link state update?
A . It must participate in a new election for the Designated Router and Backup D
C . It must initiate a graceful restart timer.
D . It must re-establish adjacency with its Designated Router and Backup D
F . It must run the shortest path first algorithm.

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Answer: D