You are the desktop administrator for your company. All employees have Windows XP Professional portable computers. A sales representative named Richard has a local user account on his computer. Richard is issued a portable USB print device. You log on to his computer and disable the restrictions on loading unsigned drivers. All other local computer policies are configured with the default settings. You restart Richard’s computer. Then Richard connects the USB print device, but the printer does not appear in the Printers folder, and Richard cannot print any documents. You need to ensure that Richard can install the printer and print successfully. What should you do?（） 

• A、Add Richard to the local Print Operators group on his computer.
• B、Add the /fastdetect switch in the Boot.ini file on Richard’s computer. 
• C、Disable the Prevent users from installing printer drivers local security policy setting. 
• D、Modify the Driver Signing Options, selecting the Make this action the system default check box.