Which command is used to enable Cisco NSF for BGP?

Which command is used to enable Cisco NSF for BGP?

A.
6500(config-router)# bgp graceful-restart

B.
6500(config-router)# bgp nsf

C.
6500(config)# bgp enable nsf

D.
6500(config-router)# enable nsf-capable

E.
6500(config-router)# nsf