Question: In a Multimedia Broadcast/Multicast Service (MBMS) using FLUTE for file delivery, what is the primary purpose of the 'group' field in the FLUTE FDT instance and file elements?
Option 1: To prioritize the download of larger files over smaller ones.
Option 2: To enable encryption for specific groups of files.
Option 3: To logically group related files together for synchronized download, ensuring all files within a group are downloaded if any file from the group is requested.
Option 4: To specify the storage location for downloaded files on the User Equipment (UE).
Explanation: The 'group' field's main purpose is to facilitate logical grouping of related files. This ensures that if a UE requests one file from a group, all files within that group will be downloaded, unless the UE instructs its FLUTE receiver to ignore this grouping (e.g., due to low storage availability), maintaining the integrity and completeness of multi-file deliveries.