Question: What is a key requirement for a player conforming to the 3GP Extended-presentation profile (branded '3ge9') when rendering a 3GP file?
Option 1: The player must prioritize audio tracks over video tracks in the multimedia presentation.
Option 2: The player shall render the content as prescribed by the contained scene description (primary item).
Option 3: The player is required to download all referenced media files before starting playback.
Option 4: The player should automatically switch to a different profile if the scene description is incomplete.
Explanation: This option is correct because, according to specifications, a conforming player must render the content of the 3GP file exactly as prescribed by the contained scene description, ensuring playback in the manner intended by its creator, utilizing tracks, media files, and scene descriptions appropriately.