Your network contains a single Active Directory domain. The domain contains a System Center Configuration Manager 2007 R

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Your network contains a single Active Directory domain.
The domain contains a System Center Configuration Manager 2007 R3 site and a System Center 2012 R2 Configuration Manager Service Pack 1 (SP1) site.
You need to ensure that you can migrate objects from Configuration Manager 2007 R3 to System Center 2012 R2 Configuration Manager SP1.
What should you do?

A. Assign the computer account of the Central Administration site server permission to the Configuration Manager 2007 R3 site. Assign the computer account of the Central Administration site server permission to the Microsoft SQL Server database instance.
B. Connect the System Center2012 R2 Configuration Manager SP1 primary site as a child primary site of the System Center Configuration Manager 2007 R3 primary site.
C. Extend the Active Directory schema and assign the Central Administration site server permissions to the System\System Management container.
D. Connect the System Center Configuration Manager 2007 R3 primary site as a child primary site of the System Center 2012 R2 Configuration Manager SP1 primary site.