Which groundbreaking invention, first used at an Ohio supermarket in 1974, revolutionized retail checkout and became the foundation of modern POS systems?

The invention of Point of Sale (POS) systems revolutionized retail forever, transforming how businesses track inventory and process transactions. Behind these systems lies an impressive history of innovation spanning decades. This trivia question explores a pivotal moment in retail technology history that changed shopping experiences worldwide. Test your knowledge about the breakthrough that paved the way for today's sophisticated checkout solutions!

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The UPC barcode scanner, which reduced checkout time by 40% and enabled automated inventory tracking
The electronic cash register with integrated credit card processing, eliminating paper receipts
The touchscreen terminal interface, allowing cashiers to select items from visual menus
The automated change dispenser, which calculated and returned exact change to customers