A vSphere administrator sees the alarm: vSphere HA virtual machine failed to failover. This occurred for a number of virtual machines on a particular ESXi hosts in a cluster with vSphere High Availability (HA) enabled. The virtual machine guest operating systems never reported a power event. What occurred?

a. The virtual machines were vMotioned off of the ESXi host.
b. The ESXi host failed and vSphere HA successfully failed over the virtual machines
c. The previous virtual machine cloning operations filed to complete.
d. The ESXi hosts is still running but has disconnected from the network.

Answer: b. The ESXi host failed and vSphere HA successfully failed over the virtual machines