单选题The policy action of color is used for congestion control under which circumstance?（）Acongestion in an upstream routerBcongestion in a downstream routerCcontention for queue space on an egress interfaceDcontention for queue space on an ingress interface
单选题
The policy action of color is used for congestion control under which circumstance?（）
A
congestion in an upstream router
B
congestion in a downstream router
C
contention for queue space on an egress interface
D
contention for queue space on an ingress interface
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