What are the steps for configuring stateful NBAR for dynamic protocols？ （）

• A、use the command ip nbar protocol-discovery to allow identification of stateful protocols. Use the command ip nbar port-map to attach the protocols to an interface
• B、use the command match protocol rtp to allow identification of real-time audio and video traffic. Use the command ip nbar port-map to extend the NBAR functionality for well-known protocols to new port numbers
• C、use the command match protocol to allow identification of stateful protocols. Use the command ip nbar port-map to attach the protocols to an interface
• D、configure a traffic class. Configure a traffic policy. Attach the traffic policy to an interface. 
• E、configure video streaming. Configure audio streaming. Attach the codec to an interface