What is the minimum number of disk required for striping and parity across all disks?

A.
2

B.
3

C.
4

D.
5

Explanation:
RAID-5 uses striping and parity across all disks to provide fault tolerance and requires a minimum of three disks.
Incorrect
Answers:
A: Mirroring requires a minimum of two disks. Striping and parity across all disks requires a minimum of three disks.
C, D: It is possible to use more than three disks for striping and parity across all disks, but the minimum required is three disks.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 184-192.
David Groth and Toby Skandier, Network+ Study Guide (4th Edition), Sybex, Alameda CA, 2005, pp. 381-382.