You have an Exchange Server 2010 organization. You need to install the Hub Transport server role on a new server. You install all the prerequisites for the Hub Transport role on the server.  What should you do next（）？ 

• A、From Windows PowerShell， run the Add-WindowsFeature cmdlet.
• B、From Windows PowerShell， run the Install-TransportAgent.ps1 script.
• C、At the command prompt， run Setup.com /M：Install /R：Ht.
• D、At the command prompt， run ServerManagerCmd.exe -IP Exchange-HUb.xml.