Question: What is the primary purpose of the St reference point in a telecom network, specifically between the PCRF (Policy and Charging Rules Function) and TSSF (Traffic Steering Support Function)?
Option 1: To manage Quality of Service (QoS) parameters for ongoing sessions.
Option 2: To facilitate user authentication across different network domains.
Option 3: To provision traffic steering control information from the PCRF to the TSSF.
Option 4: To handle billing and charging for data services.
Explanation: The St reference point's main function is enabling the PCRF to provision traffic steering control information to the TSSF, crucial for managing network resources and directing traffic as per policy rules, ensuring optimal network performance and user experience.