You have 50 virtual machines (VMs) running across five ESXi hosts in a DRS Cluster in a production environment for a number of weeks. Several VMs running on one of the ESXi hosts suddenly blue- screen.

What is the most likely cause of the failure?

A.
A patch recently applied to all virtual machines.

B.
A driver recently applied to all virtual machines.

C.
A VMkernel panic on the ESXi host running the failed virtual machines.

D.
A hardware problem on the ESXi host running the failed virtual machines.