Which statement is true about upgrading the firmware on a Cisco MDS storage switch with dual supervisors?

Which statement is true about upgrading the firmware on a Cisco MDS storage switch with dual supervisors?
A . The standby supervisor must be offline before the firmware upgrade begins.
B . Both supervisors load the new firmware and then the active supervisor reboots.
C . Supervisors can be upgraded independently to test the new firmware.
D . The new firmware is load on the standby supervisor first.

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Answer: D