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.