Which of the following causes the BGP neighbor relationship failed to be established?

Which of the following causes the BGP neighbor relationship failed to be established?
A . ACLs that block all TCP connections are configured between the two BGP neighbor relationships.
B . IBGP neighbors are non-physically connected.
C . BGP synchronization is enabled in the fully interconnected IBGP neighbor relationship.
D . The update time between the two BGP neighbors is inconsistent.

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Answer: A