An administrator has recently upgraded their Update manager infrastructure to vSphere 5. Several hosts and virtual machines have not been upgraded yet.
Which vSphere object cannot be upgraded by Update Manager when running against a legacy host?

A.
Virtual Machine Hardware

B.
ESX Host

C.
ESX Patches

D.
VMware Tools

Explanation:

Ref: Page 142 from vsphere-esxi-vcenter-server-50-upgrade-guide.pdf