Your company has a main office and a branch office that are configured as a single Active Directory forest. The functional level of the Active Directory forest is Windows Server 2003. There are four Windows Server 2003 domain controllers in the main office. You need to ensure that you are able to deploy a read-only domain controller （RODC） at the branch office. Which two actions should you perform（）

A. Run the adpreplrodcprep command.
B. Raise the functional level of the forest to Windows Server 2008.
C. Raise the functional level of the domain to Windows Server 2008.
Deploy a Windows Server 2008 domain controller at the main office.