What ensures that sessions remain active during network transitions in a TSC?

The choice indicating session persistence mechanisms is the correct answer because these mechanisms are specifically designed to maintain the state and connectivity of sessions as clients move across different network connections or points.

Session persistence ensures that user sessions can continue seamlessly during transitions, such as moving between different Wi-Fi access points or from Wi-Fi to cellular networks. By implementing techniques such as sticky sessions or session replication, the TSC can track user activity and session state, allowing users to retain their session without interruption.

In contrast, increased bandwidth, higher system costs, and limited user access do not address the need for continuity in session connections across network changes. While increased bandwidth can improve overall performance, it does not guarantee that a session will remain active; similarly, higher costs and restricted access do not contribute to maintaining session states. Therefore, session persistence mechanisms are crucial for ensuring uninterrupted connectivity, enhancing user experience during network transitions.