Which inventor created and patented the first self-checkout system in 1992, revolutionizing retail customer experience?

The retail landscape has been transformed by numerous technological innovations throughout history. One of the most impactful for customer experience has been the self-checkout system, which revolutionized how shoppers complete their purchases. This invention significantly changed store operations, customer flow, and the overall shopping experience. Test your knowledge about this pivotal retail technology that bridged traditional shopping with the digital age.

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Dr. Howard Graham, who called it the 'Automated Checkout Terminal'
David R. Humble, inspired after watching customers struggle in a long grocery line
Jennifer Blackston, a Walmart engineer who developed the 'ExpressLane System'
Kenji Yoshida, whose 'ShopperScan' was first implemented in Japanese supermarkets