Question: In a 3GPP 3GP file, how can individual media tracks within the Movie box be specifically addressed by a scene description (primary item) using relative URLs?
Option 1: By referring to the filename of each media track
Option 2: By using an absolute URL pointing to the 3GP file's directory
Option 3: By listing their track numbers in the format "#box=moov;track_ID=" followed by one or more track numbers (e.g., "#box=moov;track_ID=1,3")
Option 4: By omitting the track ID, allowing default addressing of all tracks
Explanation: This is correct because the provided specification defines the relative URL for a track, enabling the scene description to specifically address individual media tracks within the Movie box by listing their track numbers in the specified format, ensuring precise referencing.