Background: LaserDisc's support for multiple audio tracks allowed for vast supplemental materials to be included on-disc and made it the first available format for "Special Edition" releases; the 1984 Criterion Collection edition of Citizen Kane is generally credited as being the first "Special Edition" release to home video,[citation needed] and for setting the standard by which future SE discs were measured. The disc provided interviews, commentary tracks, documentaries, still photographs, and other features for historians and collectors.
Question: What feature, unique to LaserDisc, made bonus content possible?
Answer:<extra_id_0>.
<extra_id_0> support for multiple audio tracks<extra_id_1>