Which occurrence happens during an ISSU in a single supervisor configuration?

Which occurrence happens during an ISSU in a single supervisor configuration?
A. The control plane is offline for up to 300 seconds.
B. The time-to-live value for CDP is increased (360 seconds) if it is less than the recommended timeout value.
C. FLOGI/fdisc or logo requests from servers fail until the ISSU is complete.
D. NTP sessions stay alive and active.

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