Question: In a Policy and Charging Control (PCC) architecture, how are downlink packet marking instructions for a dynamic Application Detection and Control (ADC) rule encoded when provisioned by the Policy and Charging Rules Function (PCRF) to the Traffic Detection Function (TDF)?
Option 1: Using a dedicated IP header flag within the ADC-Rule-Definition AVP
Option 2: Within a ToS-Traffic-Class Attribute Value Pair (AVP) of the ADC-Rule-Definition AVP
Option 3: Through a separate, standalone packet marking AVP outside the ADC-Rule-Definition AVP
Option 4: By modifying the DSCP value in the IP header of the downlink packets directly
Explanation: The correct encoding method for downlink packet marking instructions involves utilizing a ToS-Traffic-Class Attribute Value Pair (AVP) nested within the ADC-Rule-Definition AVP, ensuring standardized and efficient communication between the PCRF and TDF for dynamic ADC rule provisioning.