You are planning to perform hardware maintenance on one of your ESXi hosts. It is currently
running several Virtual Machines that you do not wish to power off. Which vCenter feature will
allow you to perform this maintenance without disrupting the VMs?

A.
vMotion

B.
High Availability

C.
vSphere Replication

D.
vSphere Distributed Switch

Explanation:
http://www.vmware.com/products/vsphere/features-vmotion