Question: What is the primary function of the TDF when used for application-based charging in a convergent scenario, as it relates to the Gzn reference point?
Option 1: To transport online charging information for seamless WLAN offloaded traffic from a 3GPP UE.
Option 2: To enable transport of offline charging information for both Non-seamless WLAN offloaded traffic from a 3GPP UE and for fixed devices.
Option 3: To perform authentication and authorization for fixed devices in a convergent scenario.
Option 4: To manage charging for roaming subscribers in a non-convergent scenario.
Explanation: The correct answer is Option 2 because the TDF, when used for application-based charging in a convergent scenario, performs the same functionality as outlined in the document and also enables transport of offline charging information for both Non-seamless WLAN offloaded traffic from a 3GPP UE and for fixed devices via the Gzn reference point.