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 BDC. Promote the BDC to a PDC. Then 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.