You are a desktop support technician for your company. The computers in your company run Windows Vista by using an administrator account. When you perform an adminsitrative task, you are not prompted for credentials. You need to ensure that all administrative tasks prompt for credentials. You also need to ensure that users cannot remotely access your local user account. What should you do?

A.
Right-click shortcuts to applications and use Run as a feature.

B.
Enable Windows Firewall and restart the Windows firewall service.

C.
Enable the User Account Control feature and restart the computer.

D.
Configure the Secondary Logon service to start automatically and restart the computer.