IS management has decided to install a level 1 Redundant Array of Inexpensive Disks (RAID) system in all servers to compensate for the elimination of offsite backups. The IS auditor should recommend: 
A、upgrading to a level 5 RAID. 
B、increasing the frequency of onsite backups. 
C、reinstating the offsite backups. 
D、establishing a cold site in a secure location.