You have a server that runs Windows Server 2012 R2.
You need to create a volume that will remain online if two disks in the volume fail.
The solution must minimize the number of disks used to create the volume.
Which three actions should you perform in sequence?

A.
Add five physical disks

B.
Create a storage space and set the disk allocation of one of the disks to “Hot Spare”

C.
Create a virtual disk

D.
Create a storage space by using the default disk allocation

E.
Add three physical disks

Explanation:
A storage space with three-way mirroring can tolerate two disk failures but requires a minimum of five disks.

http://technet.microsoft.com/en-us/library/hh831739.aspx
http://technet.microsoft.com/en-us/library/jj822938.aspx
http://technet.microsoft.com/en-us/library/jj899886.aspx
http://technet.microsoft.com/en-us/library/5de72fb5-e1e3-43a7-a176-d17cdf4d312e