TwoBGPpeersconnectedthrougharoutedfirewallareunabletoestablishapeeringrelationship.Whatcouldbethemostlikelycause?()

A.BGPpeersmustbeLayer2-adjacent.

B.EBGPmultihopisnotconfigured.

C.ThefirewallisnotconfiguredtoallowIPprotocol89.

D.ThefirewallisnotconfiguredtoallowUDP179.