Which Flexible NetFlow configuration exports a flow when it is idle for 20 seconds to avoid overloading the flow collector?

The correct answer configures a Flexible NetFlow monitor named monitorflow to export flow records based on inactivity. The cache timeout inactive 20 command specifies that a flow record will be exported if no new packets matching that flow are observed for 20 seconds. The cache timeout active 120 command sets the active timeout, meaning a flow will be exported every 120 seconds even if it's still active. cache type immediate ensures that flows are exported as soon as they meet the timeout criteria. The first incorrect option uses flow record instead of flow monitor for the main configuration, which is syntactically incorrect for defining the export behavior. The third option uses cache type permanent, which means flows are never aged out by the system and would not be exported based on inactivity, defeating the purpose of the 20-second idle timeout. The fourth option only defines a flow record's matching and collection criteria but does not configure any export parameters or timeouts.