A customer wants to know what version of DirectX the current workstation has installed. Which of the following command line tools would the customer use?（）

A.Scandisk
B.Defrag
C.Indexing
D.Chkdsk

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.

A. an attempt to bring down a website or other online service.
B. a prank where someone sends an unauthorized e-mail attempting to close a user’s e-mail account.
C. stealing a user’s identity and making changes to their accounts.
D. an attempt to change a user’s password to prevent access to a service by repeatedly guessing the user’s information.