Choose the true stat

Choose the true statement regarding QoS pre-classify.（）

AQoS pre-classify permits making QoS decisions based on elements from the unencrypted IP packet.
BQoS pre-classify is required when encrypting voice.
CQoS pre-classify is an advantage to Service Providers transporting encrypted packets.
DQoS pre-classify is not designed for IPSec/GRE configurations.

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参考解析：

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