Your network uses Multiple Activation Key (MAK) licenses. You perform a Server Core installation of
Windows Server 2008 R2. During the installation, you enter the license key. You need to activate
Windows Server 2008 R2 on the server. Which command should you run?

A.
slmgr.vbs -ipk

B.
install-callpack

C.
ocsetup.exe was-windowsactivationservice

D.
slmagr.vbs -ato

Explanation:
(If you already entered the product key during Windows Setup, you can skip this first step.) Then,
type the following command to perform the actual activation:
slmgr –ato
You can also use Slmgr command to activate a remote installation. For more information,
type slmgr at a command prompt.