On which product was the world's first commercial barcode scanned in a retail transaction?

In the history of retail, few innovations have been as transformative as the humble barcode. This standardized method of product identification revolutionized inventory management, checkout speed, and the entire shopping experience. But do you know when this retail revolution began? Test your knowledge of this pivotal moment in retail history!

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A pack of Wrigley's chewing gum
A carton of milk
A loaf of Wonder bread
A can of Coca-Cola