Question: What is the primary purpose of the TDF-Application-Identifier AVP in the context of Policy and Charging Control (PCC)?
Option 1: To identify the type of User Equipment (UE) connected to the network.
Option 2: To specify the Quality of Service (QoS) parameters for a particular bearer.
Option 3: To authenticate users before granting network access.
Option 4: To reference an application detection filter for PCC rule application and reporting between PCEF and PCRF.
Explanation: The TDF-Application-Identifier AVP is designed to reference an application detection filter, crucial for applying PCC rules in the Policy and Charging Enforcement Function (PCEF) for application detection and control, and for reporting to the Policy and Charging Rules Function (PCRF), enabling appropriate network management and charging based on predefined policies.