When would you need to configure QoS preclassify?

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You are designing the QoS features for a large enterprise network that includes DMVPN.

When would you need to configure QoS preclassify?
A . when you are marking packets with the DSCP bits
B . when you are marking packets with the TOS bits
C . when your service provider requires the DSCP bits be set
D . when the QoS policy cannot be based on DSCP ToS bits

Answer: D