Your company has a main office and a branch office.
The network contains a single Active Directory domain.
The main office contains a domain controller named DC1.
You need to install a domain controller in the branch office by using an offline copy of the
Active Directory database.
What should you do first?

A.
From the Ntdsutil tool, create an IFM media set.

B.
From the command prompt, run djoin.exe /loadfile.

C.
From Windows Server Backup, perform a system state backup.

D.
From Windows PowerShell, run the get-ADDomainController cmdlet.

Explanation:

http://technet.microsoft.com/en-us/library/cc816722%28v=ws.10%29.aspx
Installing an Additional Domain Controller by Using IFM
When you install Active Directory Domain Services (AD DS) by using the install from media
(IFM) method, you can reduce the replication traffic that is initiated during the installation of
an additional domain controller in an Active Directory domain. Reducing the replication traffic
reduces the time that is necessary to install the additional domain controller.
Windows Server 2008 and Windows Server 2008 R2 include an improved version of the
Ntdsutil tool that you can use to create installation media for an additional domain controller.
You can use Ntdsutil.exe to create installation media for additional domain controllers that
you are creating in a domain. The IFM method uses the data in the installation media to
install AD DS, which eliminates the need to replicate every object from a partner domain
controller. However, objects that were modified, added, or deleted since the installation
media was created must be replicated. If the installation media was created recently, the
amount of replication that is required is considerably less than the amount of replication that
is required for a regular AD DS installation.