Your network contains a stand-alone root certification authority （CA）. You have a server named Server1 that runs Windows Server 2008 R2.  You issue a server certificate to Server1. You deploy Secure Socket Tunneling Protocol （SSTP） on Server1.   You need to recommend a solution that allows external partner computers to access internalnetwork resources by using SSTP.   What should you recommend？（）

• A、Enable Network Access Protection （NAP） on the network.
• B、Deploy the Root CA certificate to the external computers.
• C、Implement the Remote Desktop Connection Broker role service.
• D、Configure the firewall to allow inbound traffic on TCP Port 1723.