What are three common problems that can cause a BGP neighbor state to toggle between the idle state and the active state? (Choose three.)

What are three common problems that can cause a BGP neighbor state to toggle between the idle state and the active state? (Choose three.)
A . BGP network command misconfiguration
B . route policy misconfiguration
C . AS number misconfiguration
D . route map misconfiguration
E . BGP neighbor peering to wrong IP address
F . IGP routing problem: not able to reach the source IP address of the BGP open packet

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Answer: C,E,F