Which two actions should be taken before an upgrade is started on a Cisco MDS switch? (Choose two.)

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Which two actions should be taken before an upgrade is started on a Cisco MDS switch? (Choose two.)
A . check the impact of the upgrade using the show install all impact command
B . disable Cisco Fabric Services
C . back up the configuration
D . free up space on the USB3 device by deleting old Cisco NX-OS image files
E . make the primary supervisor the active supervisor

Answer: A,C