You are the administrator of your company’s network. A user named Tom in the art department wants to update his Windows 2000 Professional computer so that he can view graphics at the highest resolution. Tom downloads a video card driver from the Internet and then asks of your assistance in installing it. You are unsure of the source of driver. You want to ensure that Tom does not loose productive time because of the incompatible driver. What should you do？（）

A.Install the driver into the computer. Restart the computer. Use the last known good configuration to recover the original driver if necessary. 
B.Install the driver in the computer. Use the hardware troubleshooter and then use the recovery console to recover the original driver if necessary. 
C.Display the advanced attributes of the video card driver file. Install the file only if the contents have been secured. 
D.Run file signature verification utility to verify that the driver has been digitally signed. 

A.Configure driver signing to display a message before installing an unsigned driver.
B.Configure driver signing to ignore file signature verification. Create a local computer policy to enable windows file protection.
C.Use the Add Printer wizard to install the driver and create a local computer policy to enablewindows file protection.
D.Use the printer troubleshooter configures the computer to prevent the installation of unsigned drivers.

A.Ignore - Install all files， regardless of file signature
B.Warn - Display a message before installing an unsigned file
C.Block - Prevent installation of unsigned files
D.Apply setting as system default