You have three Windows Server 2012 R2 servers that are set up as a Hyper-V cluster. You use System Center
2012 R2 Virtual Machine Manager to manage the Hyper-V environment. Users report that when a Hyper-V host
server becomes overloaded, the performance of the virtual machines is unacceptable.
You need to analyze workloads and automatically migrate virtual machines from overloaded host servers to
host clusters that have available capacity.
What should you configure?

A.
Performance and Resource Optimization (PRO)

B.
Placement Rules

C.
shared .vhdx file

D.
Dynamic Optimization

Explanation:
http://technet.microsoft.com/en-us/library/gg675109.aspx