When Performing a BIOS or Firmware Upgrade on Physical Host

Multiple Choice

When performing a BIOS or firmware upgrade on physical host servers, why is it important to have vSphere access?

A) The VMs must be restarted before the upgrade process.
B) vSphere is needed to shut down the physical server.
C) VMs must be shut down before the process.
D) The server must be placed in maintenance mode before the upgrade.