What is the impact on the control plane of the switch?

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An engineer is performing an ISSU upgrade on the Cisco MDS 9000 Series Switch .

What is the impact on the control plane of the switch?
A . It remains down until the next reboot.
B . It remains up throughout the update.
C . It remains down for more than 80 seconds but less than 140 seconds.
D . It is down for less than 80 seconds.

Answer: D