Which three conditions can cause BGP neighbor establishment to fail? (Choose three.)

A.
There is an access list blocking all TCP traffic between the two BGP neighbors.

B.
The EBGP neighbor ebgp-multihop option is set to the default value.

C.
The IBGP neighbor is not directly connected.

D.
BGP synchronization is enabled in a transit autonomous system with fully-meshed IBGP neighbors.

E.
The BGP update interval is different between the two BGP neighbors.

F.
The BGP neighbor is referencing an incorrect autonomous system number in its neighbor statement.