Which of the following statements regarding OSPF neighbor relationship and adjacency is true?

Which of the following statements regarding OSPF neighbor relationship and adjacency is true?
A . OSPF routers must establish an adjacency before exchanging information.
B . Not all neighbors can establish adjacencies.
C . Adjacencies are maintained using OSPF Hello protocol.
D . Neighbor relationships are selected from adjacencies to exchange routing information.

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Answer: B