The Certkiller administrator is in the process of configuring a new RAID array and wants to know which of the RAID levels uses RAID 1 first, after splitting the eight drives into four sets of two drives each and RAID 0 is now applied by individually striping across all four sets?

A.
RAID 0+1

B.
RAID 4

C.
RAID 6

D.
RAID 1+0

Explanation:
The RAID 1+0 combination of implementations applies RAID 1 first, after splitting the eight drives into four sets of two drives each.
Incorrect
Answers:
A: The RAID 0+1 combination of implementations uses RAID 0 strictly because of its high performance and RAID 1 for its high fault tolerance.
B: The RAID 4 implementation uses independent data disks along with a shared parity disk and the block level striping can be adjusted for different applications.
C: The RAID 6 implementation uses independent data disk arrays with two distributed parity blocks and it then stripes blocks of data and parity across an array of drives similar to RAID 5 where two sets of parity information for each parcel of data, requiring two drives to do so.
Reference:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 189