单选题Which of the items stated is typically the most expensive method of improving QoS across WAN links？（）A advanced queuingB data compressionC header compressionD increasing link capacity
单选题
Which of the items stated is typically the most expensive method of improving QoS across WAN links？（）
A
advanced queuing
B
data compression
C
header compression
D
increasing link capacity
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解析：
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