You are a desktop support technician for your computer. The computers in your company run Windows Vista. When you perform a routine maintenance task, you discover that the computers do not prompt for verification of the administrator credentials. You need to ensure that every administrative task prompts for verification of administrator credentials. What should you do?

A.
Enable the User Account Control feature.

B.
Run all the administrative tasks by selecting the Run as administrator option.

C.
Issue smart cards to users and configure each computer to prompt for the smart card.

D.
Configure all computers to elevate privileges only for executable files that are signed and executed.