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On Cisco Nexus 5000 Series Switches， where are the virtual output queues implemented， and what is the main purpose of virtual output queues？（）
A. on all ingress interfaces； to ensure maximum throughput on a per-egress， per-CoS basis
B. on all ingress interfaces； to provide independent congestion management and 16 queues
C. on all egress interfaces； so that a congested egress port does not affect traffic directed to other egress ports
D. on all egress interfaces； to prevent head-of-line blocking by utilizing multiple virtual output queues
E. on all egress interfaces； to be able to use EEE 802.1p CoS
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