The administrator wants to backup the existing VIO server software and its current configuration before applying an update.  What command will the administrator use to backup the VIO server software so that the backup can be restored from a Network Installation Manager （NIM） server or a Hardware Management Console （HMC）？（）

• A、 mksysb -t vio /mountpoint
• B、 backupios -file /mountpoint
• C、 mksysb -i /mountpoint/vio.mksysb
• D、 backupios -mksysb -file /mountpoint/vio.mksysb