What are two considerations when using SSO as a network redundancy feature? (Choose two.)

What are two considerations when using SSO as a network redundancy feature? (Choose two.)
A . requires synchronization between supervisors in order to guarantee continuous connectivity
B . the multicast state is preserved during switchover
C . must be combined with NSF to support uninterrupted Layer 3 operations
D . both supervisors must be configured separately
E . must be combined with NSF to support uninterrupted Layer 2 operations

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Answer: AC