单选题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.
单选题
Choose the true statement regarding QoS pre-classify.（）
A
QoS pre-classify permits making QoS decisions based on elements from the unencrypted IP packet.
B
QoS pre-classify is required when encrypting voice.
C
QoS pre-classify is an advantage to Service Providers transporting encrypted packets.
D
QoS pre-classify is not designed for IPSec/GRE configurations.
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