Which of the following RAID arrays should be used to achieve the BEST fault tolerance?

RAID 0 provides no fault tolerance as it uses striping without any redundancy; the failure of a single drive results in complete data loss.

RAID 3 uses striping with a dedicated parity drive, which provides fault tolerance for a single drive failure but is less fault tolerant than RAID 10 for multiple drive failures and can have performance bottlenecks.

RAID 5 uses striping with distributed parity, allowing for a single drive failure, but cannot tolerate the failure of two drives simultaneously, making it less fault tolerant than RAID 10.

RAID 10 (RAID 1+0) combines mirroring (RAID 1) and striping (RAID 0), offering excellent fault tolerance by allowing for the loss of one drive in each mirrored pair without data loss, and potentially more if the failures are in different mirrored sets. With four drives, it would typically be two mirrored pairs, striped together.