Which command is used to configure the external, confederation-wide AS number?
A. Certkiller 3(config)#router bgp {as-number}
B. Certkiller 3(config-router)#bgp confederation peers {as-number}
C. Certkiller 3(config-router)#bgp confederation identifier{as-number}
D. Certkiller 3(config-router)#bgp cluster-id{as-number}
E. Certkiller 3(config-router)#neighbor {ip address} remote-as {as-number}
