Your network contains a server named Server1 that runs Windows Server 2008 R2.
You need to configure Server1 as a Key Management Service (KMS) host.
What should you do first?

A.
At the command prompt, run slmgr.vbs and specify the /dli option.

B.
At the command prompt, run slmgr.vbs and specify the /ipk option.

C.
From the Server Manager console, run the Add Features Wizard and install the Online Responder Tools.

D.
From the Server Manager console, run the Add Features Wizard and install the Windows Process Activation Service.

Explanation:
To install a KMS host on a Windows Vista or Windows Server 2008 computer
1. Log on to the computer that will serve as the KMS host.
2. Open an elevated command prompt. To do this, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
3. To install your KMS key, type the following at the command prompt, and then press Enter:
cscript C:windowssystem32slmgr.vbs /ipk
4. Activate the KMS host with Microsoft� using one of the following:
4a. For online activation, type the following at the command prompt and then press Enter:
cscript C:windowssystem32slmgr.vbs /ato
4b. For telephone activation, type the following at the command prompt and then press Enter:
slui.exe 4
5. After activation is complete, restart the Software Licensing Service using the Service application.
Source: http://technet.microsoft.com/en-us/library/cc303280.aspx#_Install_KMS_Hosts