When running OSPF, what would cause router A not to form an adjacency with router B?

Refer to the exhibit.

When running OSPF, what would cause router A not to form an adjacency with router B?
A . The loopback addresses are on different subnets.
B . The value of the dead timers on the router are different.
C . Route summarization is enabled on both routers.
D . The process indentifier on router A is different than the process identifier on router

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Answer: B