You are a desktop support technician for your company. The computers on the corporate network run Windows Vista. You need to prevent users from installing non-trusted certificates on their computers. What should yo do?

A.
Use group policy to Enable trusted publisher lockdown.

B.
Use group policy to change the Internet Zone setting to High.

C.
Change the Internet Zone setting to High in Windows Internet Explorer 7.

D.
Change the Trusted Sites Zone setting to High in Windows Internet Explorer 7.