【多项选择题】
Which three characteristics of the traffic flow are taken into consideration when the QoS-for-VPNs feature （QoS pre-classify） provides packet classification and applies appropriate QoS service on tunnel interfaces？（）
A、A.IP precedence bits
B、B.DSCP bits
C、C.original port numbers
D、D.DE bits
E、E.source IP address
F、F.destination IP address
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