An administrator has a 6 node DRS cluster. Using vCenter Update Manager, what is the maximum number of host upgrade operations that can be performed at any given time in this cluster?

A.
2

B.
8

C.
4

D.
1

Explanation:
Mastering VMware vSphere 4, page 126.

Table 4.1: Limits for vCenter Update Manager

VUM OPERATION MAX TASKS PER HOST
Host Upgrade 1