单选题 You are the administrator of a network that consists of a single Windows NT 4.0 domain. The network contains five Windows NT Server domain controllers and 1,000 Windows NT Workstation client computers.You want to install Windows 2000 Server on a new computer. You want the new computer to act as domain controller in the existing domain.What should you do?

A、 On the new computer, install Windows NT Server 4.0 and designate the computer as a BDC in the existing domain. Promote the computer to the PDC of the domain. Upgrade the computer to Windows 2000 Server.
B、 On the new computer, install Windows NT Server 4.0 and designate the computer as a PDC in a new domain that has the same NetBIOS name as the existing Windows NT domain. Upgrade the computer to Windows 2000 Server. Use the Active Directory sites and services to force synchronization of the domain controllers.
C、 Shut down the PDC of the existing Windows NT domain from the network. On the new computer, install Windows 2000 Server, and then run the Active Directory installation wizard to install Active Directory, specifying the same NetBIOS name for the Windows 2000 domain as the existing Windows NT domain. Restart the Windows NT PDC on the network and demote it to a BDC.
D、 Shut down the PDC of the existing Windows NT domain from the network. On the new computer, install Windows 2000 Server, and then run the Active Directory installation wizard to install Active Directory as a replica in the existing Windows NT domain. Promote the new computer to the PDC of the domain. Restart Windows NT PDC on the network and demote it to a BDC.

【正确答案】 A

【答案解析】解析：Explanation: To install a Windows 2000 computer as a domain controller in a Windows NT 4.0 domain, we must first install Windows NT 4.0 the computer as a BDC in the Windows NT 4.0 domain and then promote the BDC to PDC. We must then upgrade the machine to Windows 2000 Server. When upgrading the domain controllers in a Windows NT domain to Windows 2000, we must upgrade the primary domain controller first. Incorrect answers: B: The computer must be installed as BDC and then later promoted to PDC. C: The computer must first be installed as a Windows NT 4.0 BDC and then promoted to PDC. D: The computer must first be installed as a Windows NT 4.0 BDC and then promoted to PDC.