A company has an Active Directory forest that contains 150 domains. All domain controllers run Windows Server 2003. The forest functional level is Windows 2000. The domain functional level is Windows 2000 mixed.
You are planning to migrate the domain controllers in only one domain to Windows Server 2008 R2.
You need to ensure that you can install Windows Server 2003 domain controllers in the forest after the migration. Your solution must minimize changes to the Active Directory environment.
What should you recommend? (More than one answer choice may achieve the goal. Select the BEST answer.)
A. Raise the forest functional level to Windows Server 2003.
B. Raise the domain functional level to Windows Server 2008.
C. Raise the domain functional level to Windows Server 2003.
D. Raise the forest functional level to Windows Server 2008 R2.
