When did supplements become part of the filmmaking process?

Name: When did supplements become part of the filmmaking process?
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Supplements became a significant part of the filmmaking process with the advent of the DVD age, as DVDs offered the capacity to include additional content such as director's commentary, behind-the-scenes footage, and making-of documentaries, enhancing the viewer's experience beyond just the film itself.

When Did Supplements Become Part of the Filmmaking Process