You need to make the contents in Files.vhd available to several virtual machines

You have a server named Server1 that runs Windows Server 8. Server1 has the Hyper-V server role installed.
You have fixed-size VHD named Files.vhd.
You need to make the contents in Files.vhd available to several virtual machines.
The solution must meet the following requirements:
Ensure that if the contents are changed on any virtual machine, the changes are not reflected on the other
virtual machines.
Minimize the amount of disk space used.
What should you do?

A.
Create a dynamically expanding VHDX. Transfer theinformation from Files.vhd to the new VHDX file.

B.
Create a fixed-size VHDX. Transfer the information from Files.vhd to the new VHDX file.

C.
Convert Files.vhd to a dynamically expanding VHD.

D.
Create differencing VHDs that use Files.vhd as the parent disk.

Explanation:
A: A conversion would be needed from VHD to VHDX. Not available to multiple VM’s B: Single VHD not
available to multiple VM’s. Changes wouldn’t be reflected C: A conversion would be needed from VHD to
VHDX. Not available to multiple VM’s D: Child disk for multiple VM’s with Files.vhd as parent
A differencing disk is associated with another virtual hard disk that you select when you
create the differencing disk. This means that the disk to which you want to associate the differencingdisk must
exist first. This virtual hard disk is called the “parent” disk and the differencing disk is the “child” disk. The
parent disk can be any type of virtual hard disk. The differencing disk stores all changes that would otherwise
be made to the parent disk if the differencing diskwas not being used. The differencing disk providesan
ongoing way to save changes without altering the parent disk. You can use the differencing disk to store
changes indefinitely, as long as there is enough space on the physical disk where the differencing disk is
stored. The differencing disk expands dynamically as data is written to it and can grow as large as the
maximum size allocated for the parent disk when theparent disk was created.
http://technet.microsoft.com/en-us/library/cc720381(v=ws.10).aspx