What are three reasons to collect Netflow data on a company network?（）

A. To identify applications causing congestion
B. To authorize user network access
C. To report and alert link up / down instances.
D. To diagnose slow network performance, bandwidth hogs, and bandwidth utilization.
E. To detect suboptimal routing in the network.
F. To confirm the appropriate amount of bandwidth that has been allocated to each Class of Service.