Your network contains a single Active Directory domain.
The domain contains a System Center Configuration Manager 2007 site and a System Center 2012
Configuration Manager site.
You need to ensure that you can migrate 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 permission to the Microsoft
SQL Server database instance.

B.
Connect the Configuration Manager 2007 primary site as a child primary site of the Configuration
Manager 2012 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 Configuration Manager 2012 primary site as a child primary site of the Configuration
Manager 2007 primary site.

Explanation:
http://technet.microsoft.com/en-us/library/gg712991.aspx
Determine Whether to Migrate Configuration Manager 2007 to System Center 2012 Configuration
Manager
In Microsoft System Center 2012 Configuration Manager, the built-in migration functionality
replaces in-place upgrades of existing Configuration Manager infrastructure by providing a process
that transfers data from active Configuration Manager 2007 sites. The functionality provided by
migration helps you maintain investments that you have made in configurations and deployments
while you can take full advantage of core changes in the product introduced in System Center 2012
Configuration Manager. These changes include a simplified Configuration Manager hierarchy that
uses fewer sites and resources, and the improved processing by use of native 64-bit code that runs
on 64-bit hardware.
Migration can transfer most data from Configuration Manager 2007.
http://technet.microsoft.com/en-us/library/gg681981.aspx
Planning for Migration to System Center 2012 Configuration Manager
You must first install a System Center 2012 Configuration Manager hierarchy to be the destination
hierarchy before you can migrate data from a supported source hierarchy.
After you install the destination hierarchy, configure the management features and functions that
you want to use in your destination hierarchy before you start to migrate data.
http://technet.microsoft.com/en-us/library/gg712313.aspx
Prerequisites for Migration in System Center 2012 Configuration Manager
To migrate from a supported source hierarchy, you must have access to each applicable
Configuration Manager source site, and permissions within the System Center 2012 Configuration
Manager destination site
to configure and run migration operations.
Required Configurations for Migration
..
Data Gathering

To enable the destination site to gather data, you must configure the following two source site
access accounts for use with each source site:
* Source Site Account: This account is used to access the SMS Provider of the source site.
* For a Configuration Manager 2007 SP2 source site, this account requires Read permission to all
source site objects.
* For a System Center 2012 Configuration Manager source site, this account requires Read
permission to all source site objects. You grant this permission to the account by using role-based
administration.
* Source Site Database Account: This account is used to access the SQL Server database of the
source site and requires Read and Execute permissions to the source site database.
You can configure these accounts when you configure a new source hierarchy, data gathering for an
additional source site, or when you reconfigure the credentials for a source site. These accounts can
use a domain user account, or you can specify the computer account of the top-level site of the
destination hierarchy.
Security Note: If you use the Configuration Manager computer account for either access account,
ensure that this account is a member of the security group Distributed COM Users in the domain
where the source site resides.
When gathering data, the following network protocols and ports are used:
NetBIOS/SMB – 445 (TCP)
RPC (WMI) – 135 (TCP)
SQL Server – 1433 (TCP)