Which two statements are true about nonstop active routing ( NSR)? ( Choose two.)

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Which two statements are true about nonstop active routing ( NSR)? ( Choose two.)
A . Graceful Routing Engine switchover ( GRES) must be configured for NSR to function properly.
B . When NSR is enabled, RPD runs on the backup Routing Engine.
C . NSR and graceful restart can be enabled at the same time.
D . NSR relies on helper support on neighboring routers.

Answer: AB