Which grocery store innovation, first implemented in 1974 at an Ohio Marsh Supermarket, revolutionized retail inventory management in the food industry?

The food retail industry has evolved dramatically over the decades, particularly in how inventory is tracked and managed. Before modern technology transformed grocery stores, a revolutionary product innovation changed how retailers tracked their stock forever. This innovation fundamentally altered supply chain management and is now ubiquitous in virtually every retail environment worldwide. Test your knowledge about this pivotal development in food retail history!

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Universal Product Code (UPC) barcode scanning system
Electronic shelf labeling system (ESL)
Radio-frequency identification (RFID) tagging
Computerized inventory forecasting software