问题：

[多选] 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.