Which three network management requirements are common practices in network design? (Choose three)

Which three network management requirements are common practices in network design? (Choose three)
A . Collect RMON poll information for future regression analysis
B . Ensure that all network devices have their clocks synchronized
C . Look at average counters instead of instantaneous counters for inconsistent and bursty KPIs, such as CPU utilization and interface utilization.
D . Collect SNMP poll information for future regression analysis
E . Validate data plane health, application and services availability with synthetic traffic
F . Capture both ingress and egress flow-based packets. While avoiding duplications of flows

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Answer: B,C,D