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