Which pre-defined vCenter Server role can perform tasks on ESX/ESXi host objects?

A.
Administrator

B.
Virtual Machine Power User

C.
Datacenter Administrator

D.
Resource Pool Administrator

Explanation:
vSphere Basic System Administration vCenter Server ESX ESXi, page 214.

Table 18-1. Default Roles

Role Role Type Description of User Capabilities

Administrator system All privileges for all objects.