Which Statement Is True About Upgrading the Firmware on a Cisco

Multiple Choice

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

A) Supervisors can be upgraded independently to test the new firmware.
B) The new firmware is loaded on the standby supervisor first.
C) Both supervisors load the new firmware and then the active supervisor reboots.
D) The standby supervisor must be offline before the firmware upgrade begins.