Which retail technology innovation was first introduced in 1974 by Ohio's Marsh Supermarket, fundamentally changing inventory management and checkout systems worldwide?

The evolution of retail technology has dramatically transformed how businesses operate and consumers shop. Long before modern e-commerce platforms and augmented reality experiences, certain technological innovations created watershed moments in retail history. This trivia question explores one such pivotal moment that forever changed how retailers managed inventory and processed customer transactions - a technology we now take for granted but that revolutionized the industry when first introduced.

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The Universal Product Code (UPC) barcode scanner
The electronic cash register (ECR) with digital display
The first credit card payment terminal
The electronic inventory management system (EIMS)