You are the administrator of your company's network. Your network has 20 Windows 2000 server computers in the contoso.com domain. Your network also has 250 Windows 98 computers. You want to perform a clean installation of Windows 2000 Professional on all of the Windows 98 computers. All of the Windows 98 computers are identical models and are PXE complaint. You want to accomplish the following goals: • An unattended installation of Windows 2000 Professional will be performed. • An unattended installation of company's standard applications will be performed during the installation of Windows 2000 Professional. • Each computer will be assigned a unique security identifier description. • The unattended installation script will be modified so that the computers automatically join the contoso.com domain. You take the following actions: • Install Windows 2000 Professional on a Windows 98 computer named computer1. • Install and configure computer standard applications on computer1. • Use Setup Manager on computer1 to create an unattended.txt file based on the current configuration including domain membership. • Start the remaining Windows 98 computers and then install Windows 2000 Professional. Use the unattended.txt file to provide the setting for the installation. Which result or results do these actions produce?（）

An unattended installation of Windows 2000 Professional will be performed.
B. An unattended installation of company’s standard applications will be performed during the Installation of Windows 2000 Professional.
C. Each computer will be assigned a unique security identifier description.
D. The unattended installation script will be modified so that the computers automatically join the contoso.com domain.