You need to ensure that the virtual machines remainonline during any reboots required by the updates

You are the virtualization administrator for an organization that manages private and public cloud-based
resources. The organization uses Windows Server 2008 R2 SP1 Hyper-V. All Hyper-V host servers are
configured as nodes in a four-node cluster. The organization also
uses System Center 2012 R2.
Operating system updates to each host server require a system reboot.
You need to ensure that the virtual machines remainonline during any reboots required by the updates.
What should you do?

A.
Apply updates by using the Virtual Machine Servicing Tool (VMST).

B.
Configure orchestrated updates of Hyper-V host clusters in System Center 2012 R2 Virtual Machine
Manager (VMM).

C.
Implement cluster-aware updating with the Cluster-Aware Updating (CAU) wizard.

D.
In System Center 2012 R2 Configuration Manager, add all of the servers to a collection.
Deploy updates to the collection.