What is the result when an active route processor fails in a design that combines NSF with SSO?

What is the result when an active route processor fails in a design that combines NSF with SSO?
A . An NSF-aware device immediately updates the standby route processor RIB without churning the network
B . The standby route processor temporarily forwards packets until route convergence is complete
C . An NSF-capable device immediately updates the standby route processor RIB without churning the network
D . The standby route processor immediately takes control and forwards packets along known routes

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Answer: B