What would cause the remediation to fail?

An administrator is using Update Manager 5.0 to update virtual appliances in a vSphere environment. The environment is using the vCenter Server appliance. The administrator is unable to remediate the vCenter Server appliance.
What would cause the remediation to fail?

A.
Updating of the appliance can only be done if the vCenter Server Appliance has been

B.
Remediation must be configured on the Appliance Administration page before use

C.
Remediation of the vCenter Server Appliance with Update Manager is not supported

D.
Remediation of the vCenter Server Appliance must be done from the PowerCLI

Explanation:

Page 131 of vsphere-update-manager-50-install-administration-guide.pdf

NOTE Update Manager 5.0 does not support virtual machine patch baselines.
If a host is connected to vCenter Server by using an IPv6 address, you cannot scan and remediate virtual machines and virtual appliances that run on the host.
Remediation of VMware vCenter Server Appliance is not supported. For more information about upgrading the virtual appliance, see the vCenter Server upgrade documentation.