An administrator is given two hard drives and asked to build a redundant storage solution. Which of the following RAID levels should the administrator use?

RAID 0 stripes data across drives for performance gains but offers zero redundancy - a single drive failure causes complete data loss.

RAID 1 mirrors data identically across two drives, ensuring that if one drive fails the other contains a complete copy of all data. It requires a minimum of exactly two drives, making it the only viable redundant RAID configuration when limited to two drives.

RAID 4 uses block-level striping with a dedicated parity drive and requires a minimum of three drives, exceeding the available two-drive count.

RAID 5 distributes parity data across all drives and also requires a minimum of three drives, making it impossible to implement with only two drives.