Which statement accurately describes Cisco NSF?
A. To configure NSF for an OSPF routing environment, all Area 0 devices and ABRs must be NSF-aware and must be configured for OSPF graceful restart.
B. To configure NSF for an IS-IS routing environment, only L1 routers must be NSF-aware and must be configured for IS-IS graceful restart.
C. To configure NSF for a BGP routing environment, all neighboring devices must be NSF-aware and must be configured for BGP graceful restart.
D. To configure NSF for an IS-IS routing environment, only L2 routers must be NSF-aware and must be configured for IS-IS graceful restart.
