Which QoS technique monitors network traffic loads and anticipates congestions at common network bottlenecks by implementing AF PHB coloring packets according to DSCP values?

Which QoS technique monitors network traffic loads and anticipates congestions at common network bottlenecks by implementing AF PHB coloring packets according to DSCP values?
A . Flow-based WRED
B . RED
C . IntServ Compliant WRED
D . DiffServ Compliant WRED

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Answer: D