An administrator wants to restrict the ability of selected administrators to install plug-ins in their
vSphere Client applications. Which of the following would accomplish this?

A.
Modify permissions for the administrators and remove the Register Extension privilege

B.
Modify permissions for the administrators and remove the CIM Interaction privilege

C.
Modify permissions for the administrators and add the Validate Session privilege

D.
Modify permissions for the administrators and add the Disable Methods privilege

Explanation:
vSphere Basic System Administration vCenter Server 4.0 ESX 4.0 ESXi 4.0, page 302.
Extensions privileges control the ability to install and manage extensions
Table A-6. Extension Privileges
Privilege Name Description
Register extension Registers an extension (plug-in)