Which statement about the configuration of the Cisco ASA NetFlow v9 (NSEL) is true ?
A. To view bandwidth usage for the NetFlow record, you must enable QoS features.
B. Use sysopt command to enable NSEL on a specific interface.
C. NSEL can be used without a collector configured.
D. NSEL tracks the flow continuously and provides updates every 10 seconds.
E. You must define a flow-export event type under a policy.
