Answer: RAID 10
Explanation: RAID is a data storage technology that joins various physical disk drives into 1 or more logical units. The aim of this is to improve performance, reduce data redundancy, or to incorporate both of these aspects.
RAID 1+0 or RAID 10, makes use of a minimum of 4 disks, to stripe data across these disks in pairs. This action combines disk striping with disk mirroring to protect data. Data is retrieved so long as 1 disk in the mirrored pair is operational. These functions can improve the system that the technician is trying to fix.