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