You configured a Flexible NetFlow flow monitor and exporter but no flow records are appearing on the collector. What additional step is required on the router to start collecting flows?

To begin collecting Flexible NetFlow records, you must define the flow record and flow monitor, and then apply the flow monitor to the specific interface(s) where you want to capture traffic, specifying the direction (ingress or egress). Without applying the monitor to an interface, the router doesn't know which traffic to analyze. Incorrect options: "Only configure the exporter; collectors will poll automatically" is incorrect because configuring an exporter only defines where the data goes; it doesn't activate the data collection itself. "Enable a global 'ip flow ingress' command to activate Flexible NetFlow" is incorrect. While ip flow ingress is used for traditional NetFlow, Flexible NetFlow uses a more granular, interface-specific application of flow monitors. "Increase the router's CPU polling interval to allow NetFlow collection" is incorrect. NetFlow collection is not directly controlled by a CPU polling interval. While CPU load can affect performance, it's not a configuration step to enable NetFlow.