What event causes an OSPF adjacency to change from ‘down’ to ‘two way’?

What event causes an OSPF adjacency to change from ‘down’ to ‘two way’?
A . The router receives a link-state update in response to a link-state request.
B . The router receives a hello packet from its neighbor that contains its own router ID in the neighbor list.
C . The router receives a database description packet from its neighbor.
D . The router receives a link-state acknowledgment in response to a link-state update.

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Answer: B