Question: What is the primary purpose of the AF-Charging-Identifier AVP in the context of Policy and Charging Control over Rx reference point?
Option 1: To authenticate the Application Function (AF) in the network
Option 2: For charging correlation with the bearer layer
Option 3: To prioritize traffic from different Application Functions (AFs)
Option 4: To encrypt data transmitted between the AF and the network
Explanation: The AF-Charging-Identifier AVP is specifically used for charging correlation purposes, linking application-level usage to the bearer layer where actual data transfer occurs, facilitating accurate billing and charging based on resource utilization at both layers.