You need to upgrade Server1 to Windows Server 2012 with…

You have a server named Server1 that has a Server Core installation of Windows Server 2008 R2. Server1 has
the DHCP Server role and the File Server role installed. You need to upgrade Server1 to Windows Server 2012
with the graphical user interface (GUI).
The solution must meet the following requirements:
Preserve the server roles and their configurations.
Minimize administrative effort.
What should you do?

A.
On Server1, run setup.exe from the Windows Server 2012 installation media and select Server with a GUI.

B.
Start Server1 from the Windows Server 2012 installation media and select Server Core Installation. When
the installation is complete, add the Server Graphical Shell feature.

C.
Start Server1 from the Windows Server 2012 installation media and select Server with a GUI.

D.
On Server1, run setup.exe from the Windows Server 2012 installation media and select Server Core
Installation. When the installation is complete, add the Server Graphical Shell feature.