Question: How can a PCRF (Policy and Charging Rules Function) indicate to a BBERF (Broadband Border Gateway Functions) that all previously provided event triggers should be removed, affecting the reporting of events requiring provisioning from the PCRF?
Option 1: By sending an empty Event-Trigger AVP in a CCA (Credit-Control-Answer) command.
Option 2: Through a specific flag in the QoS rule provisioning message indicating 'clear all triggers'.
Option 3: By omitting any Event-Trigger AVPs in subsequent RAR (Re-authorization-Request) commands.
Option 4: By providing an Event-Trigger AVP set to the value NO_EVENT_TRIGGERS in a CCA or RAR command.
Explanation: This is the correct method as per the specifications. Setting the Event-Trigger AVP to NO_EVENT_TRIGGERS explicitly instructs the BBERF to disregard all previously provisioned event triggers for reporting purposes, except for those events that are always reported without needing provisioning from the PCRF. This ensures a clear and direct communication of the PCRF's intent to reset the event trigger landscape between the two entities.