Which new feature in vSphere 6.5 would cause this?

An administrator notices that a host is evacuating all virtual machines and entering maintenance mode even though the host appears to be up and running.

Which new feature in vSphere 6.5 would cause this?
A . Predictive DRS
B . EVC Mode
C . vCenter HA
D . Proactive HA

Answer: D

Explanation:

There are two vSphere Proactive HA Automation Levels:

Manual: vCenter Server will suggest only the migration recommendations for virtual machines. You need to manually migrate the virtual machines out from the degraded hosts.

Automated: Virtual Machines will be migrated to healthy hosts and degraded hosts will be entered into remediation action either quarantine or maintenance mode depending on the configured Proactive HA automation level