Question: In a Policy and Charging Control (PCC) architecture, when a PCRF subscribes to APPLICATION_START and APPLICATION_STOP Event-Triggers for an application identified by the TDF-Application-Identifier, what additional information may be included in the Application-Detection-Information AVP sent by the PCEF upon detecting the application's start, if deducible?
Option 1: Only the corresponding TDF-Application-Identifier AVP
Option 2: Only the Flow-Direction AVP for the detected application
Option 3: The Flow-Information AVP containing both Flow-Description AVP and Flow-Direction AVP, along with a dynamically assigned TDF-Application-Instance-Identifier
Option 4: The entire set of Charging-Rule-Definition AVPs related to the application
Explanation: When the Event trigger indicates APPLICATION_START, the PCEF may include additional information to facilitate better policy decisions by the PCRF. This includes not just the basic identifier (TDF-Application-Identifier), but also more detailed flow information (Flow-Information AVP with Flow-Description and Flow-Direction) and a unique instance identifier (TDF-Application-Instance-Identifier) for correlating start and stop events, provided such details can be deduced. This comprehensive set of information is crucial for the PCRF to make informed policy updates and QoS adjustments.