Which command should you run first?

Your network contains a Windows Server 2012 R2 image named Server12.wim.
Server12.wim contains the images shown in the following table.

Server12.wim is located in C:\.
You need to enable the Windows Server Migration Tools feature in the Windows Server
2012 R2 Datacenter image. You want to achieve this goal by using the minimum amount of
administrative effort.
Which command should you run first?

A.
imagex.exe /apply c:\server12.wim 4 c:\

B.

C.
imagex.exe /capture c: c:\Server12.wim “windows server 2012 r2 datacenter”

D.
dism.exe /mount-wim /wimfile:c:\Server12.wim /index:4 /mountdir:c:\mount

Explanation:
This command will mount the image before making any changes.
Incorrect answers:
B) The imagex /capture command is used to create windows images .wim
C) You need to mount the image first.
D) The imagex /apply command is used to apply image to drive.

References:
http://technet.microsoft.com/en-us/library/cc749447(v=ws.10).aspx
http://technet.microsoft.com/en-us/library/dd744382(v=ws.10).aspx