In which country was the first commercially successful barcode scanner POS system installed in a retail store in 1974, revolutionizing checkout efficiency?

Modern retail technology has transformed how we shop across the globe. Point-of-sale (POS) systems are now ubiquitous, but their geographic origins might surprise you! This trivia question explores where this revolutionary retail technology first gained widespread commercial adoption, changing the face of shopping forever. Test your knowledge of retail tech history and its geographic roots!

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United States (at Marsh Supermarket in Troy, Ohio)
Japan (at Ito-Yokado department store in Tokyo)
United Kingdom (at Tesco supermarket in London)
Germany (at Aldi discount store in Essen)