In what year was the first commercial barcode scanned at a retail store?

Modern retail wouldn't be the same without the humble barcode. This ubiquitous innovation revolutionized inventory management and checkout processes worldwide. But do you know when this retail technology first made its commercial debut? Test your knowledge of retail history with this challenging question about one of the most transformative product innovations of the 20th century.

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1974 (on a pack of Wrigley's gum at Marsh Supermarket in Ohio)
1952 (on a Campbell's soup can at A&P grocery in New Jersey)
1981 (on a bottle of Coca-Cola at Walmart in Arkansas)
1967 (on a Tide detergent box at Kroger in California)