You successfully established a BGP session with peer, but do not see any routes learned from the peer, What would cause this problem?

You successfully established a BGP session with peer, but do not see any routes learned from the peer, What would cause this problem?

A. A routing policy is blocking BGP from learning the routes B. Unicast reverse-path-forwarding is blocking BGP from learning the routes C. A security policy is blocking BGP from learning the routes D. The firewall filter is blocking the BGP from learning the routes