Which statement about the configuration of Cisco ASA NetFlow v9 Secure Event Logging is true?

Which statement about the configuration of Cisco ASA NetFlow v9 Secure Event Logging is true?
A. To view bandwidth usage for NetFlow records, the QoS feature must be enabled.
B. A sysopt command can be used to enable NSEL on a specific interface.
C. NSEL can be used without a collector configured.
D. A flow-export event type must be defined under a policy.

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