What is the minimum number of disk required for RAID 10?

A.
2

B.
3

C.
4

D.
5

Explanation:
RAID 10 is a combination of RAID-1 and RAID-0. It implements striping in an array of two disks, and then mirroring across two arrays. This requires a minimum of four disks (two disks per array).
Incorrect
Answers:
A: RAID-0 and RAID-1 requires a minimum of two disks; however, RAID-10 requires a minimum of four disks.
B, D: RAID-10 requires a minimum of four disks.
References:
David Groth and Toby Skandier, Network+ Study Guide (4th Edition), Sybex, Alameda CA, 2005, pp. 381-382.