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During a vCenter Server upgrade, an ESXi 6.x host in a High Availability (HA) cluster fails. Which statement is true?
Correct Answer: A
Explanation/Reference: Explanation: During a vCenter Upgrade the VMware HA Agent on all of the ESXi hosts will be updated. ... it's very likely that the HA agent will fail to initialize the first time when the host restarts. During a vCenter Upgrade the VMware HA Agent on all of the ESXi hosts will be updated. After this happens the "require reboot" flag is set on the hosts, as explained in VMware KB 2034945.