Your network contains a server that has the Remote Desktop Session Host (RD Session Host) role service installed.
You need to prevent administrators from logging other administrators off of the console session.
What should you do?

A.
From the RDPTcp properties of the RD Session Host server, modify the Client Settings.

B.
From the RDPTcp properties of the RD Session Host server, modify the Sessions settings.

C.
From the Computer Configuration Group Policy settings, modify the Remote Desktop Session Host settings.

D.
From the User Configuration Group Policy settings, modify the Remote Desktop Connection Client settings.

Explanation:
Connections
Policy settings in this node control connection settings on a Remote Desktop Session Host server.
The full path of this node in the Group Policy Management Console is
Computer ConfigurationPoliciesAdministrative TemplatesWindows ComponentsRemote Desktop ServicesRemote Desktop Session HostConnections.
Deny logoff of an administrator logged in to the console session
This policy setting determines whether an administrator attempting to connect remotely to the console of a server can log off an administrator currently logged on to the console.
This policy is useful when the currently connected administrator does not want to be logged off by another administrator. If the connected administrator is logged off, any data not previously saved is lost.
If you enable this policy setting, logging off the connected administrator is not allowed.
If you disable or do not configure this policy setting, logging off the connected administrator is allowed.
Note The console session is also known as Session 0. Console access can be obtained by using the /console switch from Remote Desktop Connection in the computer field name or from the command line
Source: http://technet.microsoft.com/en-us/library/ee791922.aspx