An organization has private and public cloud resources.
The organization has Windows Server 2012 R2 servers that have the Hyper-V roll installed.
You have one four-node cluster of Hyper-V host servers.
You use System Center 2012 R2.
The virtual machines that run on the cluster must remain online when you install updates on the Hyper-V host servers.
You need to install updates on the Hyper-V host servers.
What should you do?

A.
Configure Windows Server Update Services (WSUS) to provide updates to the virtual machines hosted on the cluster.

B.
Add all the servers to a collection in System Center 2012 R2 Configuration Manager.
Deploy updates to the collection.

C.
Create orchestrated updates of Hyper-V host clusters by using System Center 2012 R2 Virtual Machine Manager (VMM).

D.
Configure Windows Update on the Hyper-V host servers to download updates from Microsoft Update.

Explanation:
NOT A, we are talking about Hyper-v hosts, then use orchestrated updates of Hyper-V host, answer C.