You create an unattended installation file named unattend.txt. You plan to use an answer file to perform an automated installation of Windows XP Professional. You need to ensure that a line-of-business application is installed automatically after the installation of Windows XP Professional is complete. What should you do?（） 

• A、Add a [GuiUnattend] section to unattend.txt.
• B、Include a [GuiRunOnce] section in unattend.txt.
• C、Create an unattend.bat file. Place the file in the root of the installation source files.
• D、Create a registry file named setup.reg. Place the file in the root of the installation source files.