Question: How can a PCRF (Policy and Charging Rules Function) remove all previously provided event triggers for a TDF (Traffic Detection Function) session?
Option 1: By sending an empty Event-Trigger AVP in a CCA (Credit-Control-Answer) or RAR (Re-Authorization Request) command.
Option 2: By providing the Event-Trigger AVP set to the value NO_EVENT_TRIGGERS in a CCA or RAR command.
Option 3: By withholding any Event-Trigger AVPs in subsequent ADC rule provisioning messages.
Option 4: By terminating the TDF session and re-initiating it without event triggers.
Explanation: According to the specified procedures for managing event triggers between PCRF and TDF, setting the Event-Trigger AVP to NO_EVENT_TRIGGERS in a CCA or RAR command is the defined method for the PCRF to signal the removal of all previously provided event triggers. This action instructs the TDF not to inform the PCRF of any events upon reception of this specific value.