Which of the following description is true about the OSPF neighbor relationship and adjacency relationship?

In the MSTP protocol, each MST Instance uses the RSTP algorithm alone to calculate a separate spanning tree.

Which of the following description is true about the OSPF neighbor relationship and adjacency relationship?
A . OSPF routers must establish adjacencies before exchanging information.
B . Not all neighbor relationships can become adjacencies
C . Adjacency is maintained by OSPF’s HELLO protocol
D . Neighbor relationship is a relationship formed by adjacency to exchange routing information.

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Answer: B