Which mechanism ensure that the active supervisor removal is not disruptive to the network operation?

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In a Cisco Catalyst switch equipped with two supervisor modules an administrator must temporally remove the active supervisor from the chassis to perform hardware maintenance on it.

Which mechanism ensure that the active supervisor removal is not disruptive to the network operation?
A . NSF/NSR
B . SSO
C . HSRP
D . VRRP

Answer: B