You are designing a migration strategy to meet the business and technical requirements. What should you do？ （）

A. Upgrade the fourthcoffee BDC to Windows Server 2003. Then upgrade the PDC to Windows Server 2003
B. Upgrade an existing domain controller to Windows Server 2003. Establish a two-way trust relationship with the fourthcoffee domain.
C. Install and configure a new Windows NT 4.0 BDPromote the BDC to a PDThen upgrade the PDC to Windows Server 2003
D. Create a new Windows 2000 Server Active Directory domain. Establish a two-way trust relationship with the fourthcoffee domain. Use the Active Directory Migration Tool （ADMT） to migrate all user and computer accounts.