Question: What is the primary purpose of sending Service Announcement (SA) metadata fragments in-band via an MBMS Download session, as opposed to relying solely on the Service Announcement Channel (SACH)?
Option 1: To reduce the overall bandwidth utilization for metadata transmission.
Option 2: To enable dynamic updates or cancellations of specific service aspects during an ongoing MBMS User Service session.
Option 3: To provide an alternative distribution method for Initialization Segments.
Option 4: To enhance security by encrypting metadata within content streams.
Explanation: The correct answer highlights the key benefit of in-band SA metadata fragments: allowing for real-time updates or cancellations of service aspects during an active MBMS User Service session, crucial for managing dynamic services efficiently. Options 1, 3, and 4 are incorrect as they either represent secondary benefits, contradict specified transmission methods, or unmentioned security enhancements.