Your network contains an Active Directory domain named contoso.com. All domain controllers run Windows
Server 2008 R2 Service Pack 1 (SP1). One of the domain controllers is named DC1.
The network contains a member server named Server1 that runs Windows Server 2012 R2.
You need to promote Server1 to a domain controller by using install from media (IFM).
What should you do first?

A.
Create a system state backup of DC1.

B.
Create IFM media on DC1.

C.
Upgrade DC1 to Windows Server 2012 R2.

D.
Run the Active Directory Domain Services Configuration Wizard on Server1.

E.
Run the Active Directory Domain Services Installation Wizard on DC1.

Explanation:
Installation from media does not work across different operating system versions. In other words, you must use
a Windows Server 2012 R2 domain controller to generate installation media to use for another Windows Server
2012 R2 domain controller installation. We can use the Install from media (IFM) option to install an Additional
Domain Controller in an existing domain is the best option such as a branch office scenario where network is
slow, unreliable and costly.
IFM will minimize replication traffic during the installation because it uses restored backup files to populate the
AD DS database. This will significantly reduce the amount of traffic copied over the WAN link.
Things to remember:
If you are deploying your first Domain Controller in the domain, you cannot use IFM.The OS will need to match the IFM media. (If you create a 2008 R2 IFM, promote a 2008 R2 DC) If you are
creating a DC that will be a Global Catalog Server, create your IFM on a Global Catalog Server.
If you are creating a DC that will be a DNS Server, create your IFM on a DNS Server. If you want to copy the
SYSVOL, the DC on which you generate the installation media and the new DC must be at least running
Windows Server 2008 with Service Pack 2 or Windows Server 2008 R2. Membership of the Domain Admins
group is the minimum required to complete IFM.