Which of the following does not provide redundancy?

A.
RAID 0

B.
RAID 1

C.
RAID 3

D.
RAID 5

Explanation:
RAID 0 provides disk striping across all disks, which improves disk access speeds, but it does not have parity and thus does not provide redundancy.
Incorrect Answers:
B: RAID-1 is a disk fault tolerance system in which two disks are exact mirrors of each

other. Should the one disk fail, the system would still be operable, the failed disk can be replaced, and the mirror rebuilt.
C: RAID-3 uses striping and parity on a dedicated drive to provide fault tolerance.
D: RAID-5 uses striping and parity drive to provide fault tolerance.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 184-192.