单项选择题

A. UAC ensures that standard users cannot access the fi……

Which of the following BEST describes the purpose of user account control (UAC) in WindowsVista?（）

A. UAC ensures that standard users cannot access the files and folders of administrative users.
B. UAC allows a computer administrator to add new user accounts to the system, configure passwords and settings for existing users, or remove existing user accounts.
C. UAC ensures that viruses and other malware cannot infect the computer, eliminating the need for third-party antivirus solutions.
D. UAC ensures that important changes cannot be made to Windows Vista without the permission of a computer administrator.

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