On an ESX Host, a particular user is assigned the Administrator role. However, when
that user logs into the vCenter Server, he has Read Only permissions. What most likely
caused this?

A.
ESX Server permission assignments do not propagate to the vCenter Server

B.
The permissions assigned on the ESX Server will not update in vCenter until the next
scheduled update interval

C.
The ESX Server is not joined to the Active Directory domain

D.
The user has Read Only permissions specifically assigned to an item, which overrides
propagated permissions

Explanation:
vSphere Basic System Administration vCenter Server 4.0 ESX 4.0 ESXi 4.0, page 211.
The privileges and roles assigned on an ESX/ESXi host are separate from the privileges
and roles assigned on a vCenter Server system. When you manage a host using vCenter
Server, only the privileges and roles assigned through the vCenter Server system are
available. If you connect directly to the host using the vSphere Client, only the privileges
and roles assigned directly on the host are available, (A).