CompTIA 220-802 Certification Practice Test

Answer: C - UAC (User Account Control) ensures that applications have only standard user privileges - regardless of the status of the user - until an administrator authorizes further permissions.
Key Takeaway: The main difference between a standard user and an administrator in WindowsVista is the level of access the user has to core, protected areas of the computer. Standard users can only install per-user software and cannot perform administrative tasks such as changing system state, turning off the firewall, configuring security policy, installing a service or a driver that affects every user on the computer, or installing software for the entire computer..
The UAC feature ensures that a user’s administrative privileges do not automatically extend to applications. This helps prevent malicious software from silently installing and causing computer-wide infection.