A system administrator at an enterprise company wants to extend the storage array of a server by using existing older disk drives. Because of the smaller size of the older drives, the administrator…

A system administrator at an enterprise company wants to extend the storage array of a server by using existing older disk drives. Because of the smaller size of the older drives, the administrator needs at least 18 physical disks. The company needs to ensure that if two drives fail simultaneously, no data loss occurs. Which RAID level should the system administrator use to configure the drives?