Question: In a 3GP file with an extended presentation, how is a scene description (e.g., SVG or SMIL) typically included or referenced within the file structure?
Option 1: Exclusively as a separate track alongside media files.
Option 2: Either in an XML box at the top level or located by an Item location box, with its MIME type specified in the Item information box.
Option 3: Only by direct reference within each media file's metadata.
Option 4: Solely through an external link referenced in the Handler box.
Explanation: This is correct because a scene description can be included in two ways: directly within an XML box at the top level of the file or indirectly by being located through an Item location box, with its MIME type specified in the Item information box.