Which packaging innovation from the 1950s revolutionized retail by allowing products to be prominently displayed while protected, leading to the modern concept of 'self-service' shopping?

The evolution of product packaging has dramatically influenced consumer behavior throughout history. From simple protective coverings to sophisticated marketing tools, packaging design has transformed how products are perceived, preserved, and promoted. This trivia question explores a pivotal innovation in packaging history that changed retail forever and created new possibilities for brand identity and product preservation.

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Blister packaging (transparent plastic sealed to cardboard backing)
Tetrapak cartons (aseptic paperboard containers)
Aluminum pull-tab cans (easy-open beverage containers)
Styrofoam clamshells (expanded polystyrene containers)