Question: What is the maximum allowed difference in delay for downlink parallel transfer of the same content via broadcast/multicast and/or unicast, to ensure all receiver group members in a given area receive the media at the same time according to user perception?
Option 1: Less than 50 ms
Option 2: Less than 100 ms
Option 3: Less than 500 ms
Option 4: Typically less than 20 ms
Explanation: This answer reflects the system's requirement to ensure user-perceived simultaneity of media reception across different transmission modes within a given area, highlighting the system's focus on maintaining a coherent user experience despite varying transmission methods.