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