An administrator is concerned about data loss caused by a drive failure and controller failure. Which of the following is the MOST appropriate RAID setup?

Disk mirroring (RAID 1) protects against a single drive failure by keeping an exact copy of data on two drives, but it does not protect against a controller failure if both drives are connected to the same controller.

Striping with parity (like RAID 5) protects against a single drive failure by distributing data and parity information across multiple drives, but it does not inherently protect against a controller failure.

Bit-level striping with parity is a description of how data and parity are written in certain RAID levels (e.g., RAID 5), which primarily protects against drive failure but does not inherently address controller failure without additional specific redundancy.

Disk duplexing is an enhancement of disk mirroring (RAID 1) where each mirrored drive pair is connected to its own dedicated disk controller. This setup provides fault tolerance against not only individual drive failures but also the failure of a single RAID controller, offering higher availability for critical data.