Solution

The correct answer is Option 2.

Key Points

• RAID (Redundant Array of Independent Disks) is a technology that provides increased storage reliability through redundancy.
• Different RAID levels use different methods to improve performance and reliability.

Additional Information

• RAID level 1: Disk mirroring (II) - In this level, data is duplicated (mirrored) across two or more disks. This provides high data reliability but reduces the storage capacity by half.
• RAID level 2: ECC organization (IV) - This level uses error-correcting codes (ECC) to improve data reliability. It is not commonly used in practice.
• RAID level 3: Bit-interleaved parity organization (I) - This level uses byte-level striping with a dedicated parity disk. It offers good performance for large read and write operations.
• RAID level 4: Block-interleaved parity organization (III) - This level uses block-level striping with a dedicated parity disk. It improves performance for large read operations but can be a bottleneck for write operations.