What is a valid example of a vSphere Update Manager upgrade?

A.
A VMware Tools upgrade on a Fault Tolerant machine with automatic snapshots.

B.
Upgrading and patching multiple ESXi hosts simultaneously in a selected cluster.

C.
Upgrading an ESX 4.1 host to ESXi 5.x with a sufficient boot partition.

D.
An ESXi 5.x host update with automatically deleted snapshots.

Explanation:
http://www.vmadmin.co.uk/vmware/35-esxserver/283-vsphere4to5migrateesx4toesxi5