Which retail innovation, directly inspired by military supply logistics during WWII, revolutionized American shopping habits and became a standard feature in modern supermarkets?

During World War II, military necessity drove remarkable retail innovations that transformed how products were marketed and sold. From K-rations to Victory Gardens, wartime shopping habits created lasting impacts on consumer culture. This poll tests your knowledge of a fascinating wartime retail innovation that changed how Americans shopped and influenced modern retail strategies. Can you identify the correct retail innovation that emerged from military logistics during this pivotal period?

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Shopping carts with metal baskets (developed after observing mobile ammunition carriers)
Self-service supermarkets (inspired by efficient military commissaries)
Standardized product barcodes (derived from military inventory tracking systems)
Frozen food sections (based on technologies developed to preserve and transport military rations)