Final answer:
RAID level 5 is known as block-interleaved distributed parity, which provides data protection and improved performance by striping data and parity across multiple disks.
Step-by-step explanation:
RAID level 5 is also known as c) block-interleaved distributed parity. This level of RAID, or 'Redundant Array of Independent Disks', provides both redundancy and improved performance.
In RAID 5, data and parity information are striped across three or more disks. When a single disk fails, the system can reconstruct the lost data using the parity information stored on the remaining disks. RAID 5 is often used in enterprise environments where both data protection and performance are important.