With regards to graceful restart, which two statements are true? (Choose two.)

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With regards to graceful restart, which two statements are true? (Choose two.)
A . A supported routing protocol, such as BGP, must be operational for graceful restart to work.
B . NSR must be enabled for graceful restart to work.
C . Dual routing engines are required for graceful restart to work.
D . The network topology must be stable for graceful restart to work.

Answer: AD