Your network includes the servers shown in the following table.

You install an additional server named Server3 that runs Windows Server 2008 R2
Enterprise. You add the Remote Desktop Services (RDS) role, and you configure the
Remote Desktop Session Host (RD Session Host) role service. You need to ensure that
RDS client access licenses (RDS CALs) can be assigned to each Remote Desktop user.
What should you do?

A.
Add RDS CALs to Server1.

B.
Specify the Remote Desktop Licensing (RD Licensing) mode on Server3.

C.
Add the Remote Desktop Licensing (RD Licensing) role service to Server3.

D.
Upgrade Server1 from Windows Server 2008 Standard to Windows Server 2008 R2
Enterprise.

Explanation:
Server1 has only standard TS licensing and we have additional server (aka server3 ) then
there is no need to upgrade or Add any additional service. (Eliminating A and D) Already
RDS role is enabled (Eliminated C option as well)

The Windows Server 2008 R2 licensing model requires a server license for each running
instance of the server software. (Remote Desktop Services is included). In addition a
Windows Server Client Access License (CAL) is required to access the Windows Server If
you wish to utilize the RDS functionality of the Windows Server software, an incremental
Remote Desktop Services Client Access License (RDS CAL) is required as well. They can
be licensing on a Device or User CAL model.