A server administrator is implementing disk redundancy in all database servers. Which of the following RAID configurations should the administrator use so that a MINIMUM number of disks are required?

RAID 0 stripes data across disks for performance but provides zero redundancy - a single disk failure results in complete data loss.

RAID 1 mirrors data identically across exactly two disks, so only two total disks are required to achieve redundancy. If one disk fails, the surviving mirror disk contains a complete copy of all data and operations continue uninterrupted. No other standard redundant RAID level can be implemented with fewer than two disks.

RAID 5 uses distributed parity and requires a minimum of three disks to function, which is more than RAID 1 needs.

RAID 6 uses dual distributed parity for two-disk fault tolerance but requires a minimum of four disks, the highest minimum disk count among these options.