Which retail payment innovation holds the Guinness World Record for 'First Self-Service Checkout System' installed in a supermarket?

The retail world has its own share of incredible achievements and world records. From the largest stores ever built to the fastest-growing brands in history, these commercial milestones showcase the extraordinary side of business. This trivia question explores a fascinating world record in retail history that changed how we think about payment systems. Test your knowledge about this revolutionary retail milestone!

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IBM's 'Shopping Buddy' system (1974)
NCR's 'CheckRobot' (1986)
Fujitsu's 'U-Scan Express' (1990)
Walmart's 'Rapid Scan' system (1992)