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?

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 is down for less than 80 seconds. B. It remains down for more than 80 seconds but less than 140 seconds. C. It remains down until the next reboot. D. It remains up throughout the update.