When a router undergoes the exchange protocol within OSPF, in what order does it pass through
each state?

A.
exstart state > loading state > exchange state > full state

B.
exstart state > exchange state > loading state > full state

C.
exstart state > full state > loading state > exchange state

D.
loading state > exchange state > full state > exstart state

Explanation:
Why Are OSPF Neighbors Stuck in Exstart/Exchange State? Reference:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0d.shtml