Disk Mirroring provides the following benefit:

• A. Security
• B. Space efficiency
• C. Redundancy
• D. Speed

Answer: (C)

Disk mirroring keeps an exact copy of all data on a second disk, so the system can continue to operate if one disk fails. The main benefit is redundancy: having a second, identical copy provides fault tolerance and preserves data availability, preventing downtime and data loss when a drive fails. This comes at the cost of using extra storage, so it isn’t space-efficient. Mirroring by itself doesn’t specifically secure data against unauthorized access, so it isn’t a security feature. While there can be speed implications—writes typically happen to both disks and may be slower, and reads can be faster by using either disk—the primary, most consistent advantage is redundancy.