What causes an adjacency to change from down to two ways?

What causes an adjacency to change from down to two ways?
A . When a link state update is received in response to a link state request.
B . When a router receives a Hello packet that contains its own router ID in the neighbor list from a neighbor.
C . When a router receives a database description packet from a neighbor.
D . When a link state acknowledgement is received in response to a link state update.

View Answer

Answer: B