Which of these product innovations, first introduced in the 1950s, revolutionized retail by creating the concept of 'frozen food aisles' and fundamentally changing how Americans shopped for and consumed food?

The history of retail has been shaped by groundbreaking product innovations that transformed how people shop and consume. From ancient marketplaces to modern e-commerce, certain products have made such an impact that they forever changed retail landscapes worldwide. This trivia question explores a pivotal innovation from the 20th century that revolutionized consumer behavior and created entirely new retail categories.

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TV dinners (first successfully marketed by Swanson in 1953)
Self-service shopping carts (introduced in 1937 but became widespread in the 1950s)
Barcode scanning technology (invented in 1949 but not commercially implemented until the 1970s)
Automatic sliding doors for supermarkets (patented in 1954 by Dee Horton and Lew Hewitt)