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

 Which of the following description of OSPF neighbor relationship and adjacency relationship is correct?
A .  The adjacency relationship is maintained by OSPF DD packets
B. OSPF routers must establish an adjacency before exchanging Hello packets
C. The neighbor relationship is selected from the adjacency relationship and formed to exchange routing information
D. Not all neighbor relationships can be adjacencies

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Answer: D