Question: What additional information does an S-CSCF include in its 200 OK response to a UE's initial or subsequent REGISTER request, as per enhanced functionalities?
Option 1: UE's supported codec list
Option 2: Its data channel capability via a Feature-Caps header field
Option 3: List of available Application Servers (AS)
Option 4: Current network congestion status
Explanation: The S-CSCF informs the UE about its data handling capabilities, facilitating efficient communication setup and management within the IMS framework, ensuring seamless media and signaling exchanges for diverse data-intensive services.