option A is correct.
NSEL is an extension of NetFlow that provides more detailed information about security-related events in a network. NSEL records include information about the source and destination addresses, ports, protocols, and actions taken by network devices, such as firewalls and intrusion detection systems, in response to those events.
Option B is incorrect because NSEL supports v9 templates, not v5 and v8 templates. Option C is also incorrect because NSEL can deliver data records to collectors through NetFlow over both TCP and UDP. Option D is incorrect because NSEL events cannot be filtered based on traffic and event type through RSVP.
The ASA and ASASM implementations of NSEL provide a stateful, IP flow tracking method that exports only those records that indicate significant events in a flow.
https://www.cisco.com/c/en/us/td/docs/security/asa/asa91/asdm71/general/asdm_71_general_config/monitor_nsel.pdf
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