Question: In the context of Wireless and Wireline Convergence for the 5G System, what is the primary purpose of the `Nnef_IPTVconfiguration_Update` service operation?
Option 1: To initiate a new AF Transaction for IPTV services
Option 2: To retrieve current IPTV configuration information from the network
Option 3: To authorize and update existing IPTV configuration based on a provided transaction ID
Option 4: To cancel an ongoing IPTV streaming session across all connected devices
Explanation: The correct answer, Option 3, accurately reflects the described purpose of the `Nnef_IPTVconfiguration_Update` operation. This operation is designed to update existing IPTV configuration information, with the process initiated by authorizing a request that is identified by an AF Transaction ID. This ensures that changes to IPTV settings are managed securely and efficiently within the 5G System's converged access framework.