You need to install Windows 2000 Professional on a new computer in your network. You use the Setup Manager wizard to configure a fully automated installation script file. You begin an unattended installation and leave the office. When you return, the installation has reached the GUI-mode Setup and you see the following error message. “Unattended Setup is unable to continue because a Setup parameter specified by you system administrator or computer manufacturer is missing or invalid.” You need to complete the installation. What must you do?（）

A. In the Unattended section of the answer file， set the OemPreinstall property to Yes.
B. In the NetBinding section of the answer file， specify the Enable variable.
C. In the UserData section of the answer file， specify the ProductID variable.
D. In the GuiUnattended section of the answer file， set the OemSkipWelcome property to 1