Which has happened?

An administrator wants to upgrade ESXi 5.5 hosts to ESXi 6.5 using Update Manager. When performing a scan for baseline compliance, the host’s status is marked Compliant.

Which has happened?
A . Host must be version 6.0 in order to upgrade to 6.5.
B . Host has some third-party software installed.
C . Host has no upgrade baseline attached.
D . Host hardware is not supported for upgrade.

Answer: C

Explanation:

http://vmiss.net/2016/12/20/upgrading-esxi-using-vsphere-update-manager-6-5-on-the-vcenter-server-appliance/