Question: Which of the following best describes the primary purpose and scope of the MBMS (Multimedia Broadcast Multicast Service) RAB Release procedure in UTRAN?
Option 1: To establish an MBMS RAB for both CS (Circuit Switched) and PS (Packet Switched) domains using connectionless signalling.
Option 2: To modify existing MBMS RAB settings for enhanced service quality in the PS domain via connection-oriented signalling.
Option 3: To request the release of an MBMS RAB specifically designed for the CS domain, utilizing connectionless signalling.
Option 4: To enable the UTRAN to request the release of an MBMS RAB defined exclusively for the PS domain, using connection-oriented signalling.
Explanation: This is correct because the MBMS RAB Release procedure's primary purpose is to facilitate the release of resources allocated for Multimedia Broadcast Multicast Services. The question accurately reflects that this procedure is specifically designed for the Packet Switched (PS) domain, which handles data services, and utilizes connection-oriented signalling, ensuring reliable and managed connections for such releases. Options 1, 2, and 3 are incorrect as they either misrepresent the domain (CS vs. PS), the signalling type (connectionless vs. connection-oriented), or the procedure's purpose (establish/modify vs. release).