Which three are characteristics of voice traffic in the Company VOIP campus network？（）

A.software voice applications
B.multipoint control unit （MCU）  
C.gatekeeper  
D.call agent
E.interactive voice response （IVR） systems  
F.softphones

A.The use of a queuing method that will give VoIP traffic strict priority over other traffic  
B.The use of RTP header compression for the VoIP traffic.
C.The proper classification and marking of the traffic as close to the source as possible
D.The use of 802.1QinQ trunking for VoIP traffic
E.The use of WRED for the VoIP traffic

A. Packet drops
B. Transmitting too many small packets
C. Variable queue delays
D. Compression
E. None of the other alternatives apply