A system administrator needs to replace a mirrored disk.  After performing the proper removal process and replacing the disk, which of the following set of commands should be performed to bring the disk back into production?（）

A. du 
B. df 
C. fsck 
D. ncheck

A. Add the following line to /etc/netsvc.conf: hosts = nis,bind,local 
B. edit /etc/netsvc.conf to add the following: process /full/path/of/process \{ hosts = local,nis,dns} 
C. In an NIS and DNS environment, NIS takes precedence over DNS in this environment resulting in no change 
D. Change the NSORDER environment variable 

A. Schedule enough down time to backup, upgrade and reboot. 
B. Backup, upgrade, then schedule enough down time to reboot the system. 
C. Backup, then schedule enough down time to upgrade and reboot the system. 
D. No scheduling processes are necessary because no down time is required.