(Topic 1) What causes an adjacency to change from "Init" to "Two Way"?

(Topic 1) What causes an adjacency to change from "Init" to "Two Way"?
A . When a Link State Update is received in response to a Link State Request
B . When a router receives a Hello packet from a neighbor that contains its router id in the neighbor list
C . When OSPF neighbors exchange Database Descriptor packets
D . When a Link State Acknowledgement is received in response to a Link State Update

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Answer: B