Your network contains an Active Directory domain named contoso.com. The domain contains a
server named Server1 that runs Windows Server 2008 R2.
You plan to test Windows Server 2012 R2 by using native-boot virtual hard disks (VHDs).
You have a Windows image file named file1.wim.
You need to add an image of a volume to file1.wim.
What should you do?

A.
Run imagex.exe and specify the /append parameter.

B.
Run imagex.exe and specify the /export parameter.

C.
Run dism.exe and specify the /image parameter.

D.
Run dism.exe and specify the /append-image parameter.

Explanation:

The Deployment Image Servicing and Management (DISM) tool is a command-line tool that enables
the creation of Windows image (.wim) files for deployment in a manufacturing or corporate IT
environment. The /Append-Image option appends a volume image to an existing .wim file allowing
you to store many customized Windows images in a fraction of the space. When you combine two or
more Windows image files into a single .wim, any files that are duplicated between the images are
only stored once.
Incorrect:
Not A, Not B: Imagex has been retired and replaced by dism.

Append a Volume Image to an Existing Image Using DISM
https://technet.microsoft.com/en-us/library/hh824916.aspx