Which famous inventor created the first self-service checkout system in 1992, transforming retail technology and setting the foundation for modern automated shopping?

The evolution of retail technology has transformed how we shop. From manual cash registers to sophisticated self-service systems, innovation has been driven by both customer convenience and business efficiency. This trivia question explores a pivotal invention in retail history that changed the shopping experience forever and paved the way for modern autonomous retail solutions.

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Dr. Howard Graham, who developed the 'ShopperMate' system at IBM
Dr. David R. Humble, whose 'CheckRobot' system was first installed at Kroger supermarkets
Sylvan Goldman, better known for inventing the shopping cart in 1937
Thomas Watson Jr., who developed the first retail barcode scanner at NCR Corporation