Which grocery chain first introduced barcode scanning at checkout in 1974, using the Universal Product Code (UPC) that would become the industry standard worldwide?

The retail industry has undergone numerous transformations over the decades, with technological innovations continually reshaping how consumers shop. One of the most significant innovations dramatically changed checkout efficiency and remains a cornerstone of retail operations today. Test your knowledge of retail history with this question about a pivotal development that revolutionized the shopping experience in the mid-20th century.

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Marsh Supermarket (part of the Kroger chain)
Walmart
Safeway
A&P (Great Atlantic & Pacific Tea Company)