You are the Certkiller administrator a user named Jack wants to know which of the RAID implementations makes use of hot spares. What would your reply be?

A.
RAID 0

B.
RAID 1

C.
RAID 2

D.
RAID 0+5

Explanation:
The RAID 0+5 implementation is used to form large arrays by combining the block striping and parity features of RAID 5 with the straight block striping of RAID 0.
Incorrect
Answers:
A: RAID 0 is the simplest level, and uses disk striping without parity thus it requires less time for disk access, but no redundancy or error correction is provided making this type of RAID solution only to be used when reliability is not vital.
B: The RAID 1 implementation uses disk mirroring, and/or disk duplexing, where duplicate information is stored on both drives.
C: The RAID 2 specification employs multiple disks for error detection and correction thus it reserves large portions of the array for non-data-storage overhead, depending on the error detection and correction algorithms used in the implementation.
Reference:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 190.