A network design team tasked to address congestion, QoS has been implemented but no longer effective?

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A network design team tasked to address congestion, QoS has been implemented but no longer effective?
A . Bundle additional uplinks into logical etherchannels
B . Configure selective packet discard to drop non-critical network traffic
C . Implement highspeed uplink interfaces
D . Reconfigure QoS based on intserv
E . Utilize random early detection

Answer: AC