Question: In a 3GP file, when multiple alternative track groups are present but no preferred combinations are specified, what is the default behavior for streaming?
Option 1: All tracks from all alternate groups are played simultaneously.
Option 2: Tracks with the lowest track IDs of each alternate group are streamed by default.
Option 3: The player randomly selects one track from each alternate group to stream.
Option 4: Streaming defaults to a single, predefined alternate group specified by the 3GPP standard.
Explanation: This is because, in the absence of explicitly encoded preferred combinations, the default behavior prioritizes consistency and predictability. By selecting tracks with the lowest track IDs from each alternate group, the system ensures a coherent playback experience without relying on random selection or assuming a predefined group that may not exist across all content.