Which two statements about the QoS policy generation phase of the Cisco SDM QoS wizard are true？（）

A、the SDM QoS wizard will create two real-time traffic classes to handle VoIP， voice signaling， and video packets

B、the SDM QoS wizard will create three real-time traffic classes to handle VoIP， voice signaling， video， and video packets

C、the SDM QoS wizard will create four real-time traffic classes to handle VoIP， voice signaling， video， and video streaming packets

D、the SDM QoS wizard will create two business-critical traffic classes to handle transactional and  network management packets

E、the SDM QoS wizard will create three business-critical traffic classes to handle transactional， network management， and routing packets

F、the SDM QoS wizard will create four business-critical traffic classes to handle transactional， network management， routing， and best-effort packets