Question: In a Policy and Charging Control (PCC) architecture, what is the primary purpose of the TDF-Application-Instance-Identifier AVP assigned by the PCEF when supporting the ADC feature?
Option 1: To authenticate User Equipment (UE) for service data flows.
Option 2: To correlate application Start and Stop events with specific service data flow descriptions.
Option 3: To prioritize service data flows based on application types.
Option 4: To encrypt service data flows between the PCEF and PCRF.
Explanation: The TDF-Application-Instance-Identifier AVP is used to allow correlation of application Start and Stop events with the specific service data flow description, especially when these descriptions are deducible. This correlation is crucial for effective policy and charging control, enabling the PCRF to make informed decisions based on detailed, application-level event triggers reported by the PCEF.