Refer to the exhibit. Where in this network should you deploy flow monitoring to monitor traffic from all the branch offices?

The Core layer sits above the WAN Distribution layer and may carry non-branch traffic, making it harder to isolate branch office flows specifically.

In a hierarchical WAN design, the WAN Distribution layer is the aggregation point where all branch office traffic is collected before being forwarded toward the core. Placing flow monitoring here ensures visibility into every branch-to-branch and branch-to-HQ flow without requiring per-branch sensor deployment, providing complete traffic visibility with minimal monitoring points.

WAN Edge devices are typically between the WAN Distribution layer and the service provider, so monitoring there may miss inter-branch traffic that is switched at the distribution layer.

Deploying monitoring at each branch device requires a large number of sensors and does not scale efficiently compared to a single aggregation point.