Your network contains a single Active Directory forest named contoso.com. Contoso.com contains three System Center 2012

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Your network contains a single Active Directory forest named contoso.com.
Contoso.com contains three System Center 2012 Configuration Manager sites and one System Center Configuration Manager 2007 site.
You need to ensure that you can transfer objects from Configuration Manager 2007 to Configuration Manager 2012.
What should you do?

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