Your virtual environment includes Windows Server 2008 R2 Hyper-V servers. You are
deploying a Remote Desktop Pool. You need to choose an operating system for the virtual
machines (VMs) in the pool. Which two operating systems will achieve this goal? (Each
correct answer presents a complete solution. Choose two.)

A.
Windows Vista Enterprise

B.
Windows 7 Enterprise

C.
Windows Server 2008

D.
Windows Server 2008 R2

Explanation:
Because Microsoft in the guide of Deploying Virtual Desktop Pools by Using Remote
Desktop Web Access Step-by-Step Guide
(http://www.microsoft.com/download/en/details.aspx?id=9647) explain
in page 5 of this document on Technology Review that Virtual desktops can only use
Windows® client operating systems. You cannot install Windows Server® 2008 R2 on a
virtual machine and add it to a virtual desktop pool.