Which music packaging innovation was specifically designed to reduce theft in retail stores while allowing customers to browse album artwork before purchase?

The music industry has continuously evolved not just in how we consume music, but also in how physical music products are packaged and presented. From vinyl sleeves to cassette cases to CD jewel boxes, packaging design has been crucial for artist expression and marketing. This poll tests your knowledge about one of the most innovative packaging designs that changed how consumers interacted with music products. Can you identify the groundbreaking packaging innovation that revolutionized the music retail experience?

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The Longbox (oversized cardboard packaging for CDs)
The Digipak (folding cardboard packaging replacing plastic jewel cases)
The Gatefold Album Cover (double-folding vinyl sleeves)
The Blister Pack (vacuum-formed plastic housing for cassettes)