Which of the following causes will lead to a failure to establish BGP peer relationships?

Which of the following causes will lead to a failure to establish BGP peer relationships?
A . An ACL is configured to prohibit all TCP connections between two BGP neighbor.
B . Two IBGP peers are not physically directly connected.
C . BGP synchronization is enabled on fully-meshed IBGP peers
D . Two BGP peers are configured with different routing Update intervals.

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Answer: A