Which of the following steps can be used to backup the Host before the upgrade is performed?

An administrator is performing an upgrade on an ESXi Host. Which of the following steps can be used to backup the Host before the upgrade is performed?

A.
Use the vCLI and run vicfg-cfgbackp -s to save the ESXi Host configuration

B.
Using the VI Client, attach to the ESXi Host and choost the Backup option from the Configuration Tab

C.
Use the ESXi Direct Console and select the Host Backup option

D.
Log on to the ESXi Host directly and execute file esxcfg-ckup -s option

Explanation:
vSphere Upgrade Guide ESX 4.0 ESXi 4.0 vCenter Server 4.0 vSphere Client 4.0 , page
71.
Back up the host configuration before you begin a host upgrade.
For more information about the VMware vSphere Command-Line Interface and the
vicfg-cfgbackup command, see the vSphere Command-Line Interface Installation and
Reference Guide.