What is a possible cause of this event?

A vSphere administrator sees the alarm:

vSphere HA virtual machine failed to failover

This occurred for virtual machines (VMs) in a cluster with vSphere High Availability (HA) enabled. The guest operating system on the VMs did not report a power failure.

What is a possible cause of this event?

A. The host is still running but has disconnected from the network.

B. The VMs cloning operations did not complete.

C. A reboot of vCenter Server impacted vSphere HA.

D. The VMs encountered an error during migration using vSphere vMotion.

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