Which of the following statements about an OSPF neighboring router are true? (Select multiple)

A: Neighbor discovery is equivalent to adjacency establishment. B: After an OSPF router receives a Hello packet from the peer OSPF router, it checks the parameters in the packet. If the parameters in the packet from the peer OSPF router are consistent with the parameters of this OSPF router, the two OSPF routers become neighbors of each other. C: After a router receives a Hello packet from the peer router, it becomes the neighbor of the peer router. D: An OSPF interface broadcasts Hello packets to discover a neighbor.