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.
Remove the plug-in or plug-ins from the vCenter Server

B.
Modify the extensions.xml file and remove the unwanted plug-ins

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

D.
Right-Click on the plug-in under Manage Plug-ins and choose Disable

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)