what is themaximum number of host upgrade operations that can be performed at any given time inthis cluster?

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.
4

B.
1

C.
8

D.
2

Explanation:
Mastering VMware vSphere 4, page 126.
Table 4.1: Limits for vCenter Update Manager
VUM OPERATION MAX TASKS PER HOST
Host Upgrade 1