You need to be able to dynamically add new storage to Windows virtual machines (VMs)

You are designing a Windows Server 2008 R2 Hyper-V environment. You need to be able to
dynamically add new storage to Windows virtual machines (VMs). What should you do?

A.
Use fixed virtual hard disks (VHDs).

B.
Install Hyper-V Integration Services on the VMs.

C.
Install the VMs in Cluster Shared Volumes (CSVs).

D.
Use dynamically expanding virtual hard disks (VHDs).