Question: In a Policy and Charging Control (PCC) architecture, when a PCRF subscribes to APPLICATION_START and APPLICATION_STOP Event-Triggers for a detected application, what additional information may be included in the Application-Detection-Information AVP if deducible, upon detection of the application's start?
Option 1: Only TDF-Application-Identifier AVP
Option 2: Only Flow-Direction AVP
Option 3: Flow-Information AVP containing Flow-Description AVP and Flow-Direction AVP, along with TDF-Application-Instance-Identifier
Option 4: Mute-Notification AVP indicating suppression of further notifications
Explanation: Upon detecting an application's start (APPLICATION_START Event-Trigger), if the service data flow descriptions are deducible, the Traffic Detection Function (TDF) may include additional information to facilitate better policy decisions by the Policy and Charging Rules Function (PCRF). This includes the Flow-Information AVP, which contains detailed attributes such as Flow-Description AVP (describing the flow) and Flow-Direction AVP (indicating the direction of the flow), along with a dynamically assigned TDF-Application-Instance-Identifier. This identifier is crucial for correlating start and stop events to specific flows, enabling more precise policy enforcement.