Which of these retail innovations originated from military technology developed during World War II and revolutionized grocery shopping?

Throughout history, military conflicts have driven retail innovations that later became mainstream commercial successes. From military surplus stores after World War II to cutting-edge technologies developed for defense purposes, the relationship between military history and retail is fascinating. This poll tests your knowledge about a significant retail innovation that emerged directly from military history and changed how we shop today.

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Barcode scanning technology, which evolved from radar systems used to identify friendly aircraft
Self-checkout kiosks, which were based on military field supply distribution systems
The shopping cart, which was inspired by military equipment transport carts
The supermarket freezer section, which utilized refrigeration technology developed to preserve military rations