In Cisco IOS-XR, the ttl-security command is configured under which configuration mode?

A.
RP/0/RSP0/CPU0:P2(config)#

B.
RP/0/RSP0/CPU0:P2(config-bgp)#

C.
RP/0/RSP0/CPU0:P2(config-bgp-nbr)#

D.
RP/0/RSP0/CPU0:P2(config-bgp-af)#

E.
RP/0/RSP0/CPU0:P2(config-bgp-nbr-af)#

Explanation:
http://packetlife.net/blog/2009/nov/23/understanding-bgp-ttl-security/