Which food retail innovation first enabled mass collection of consumer purchase data, revolutionizing inventory management and customer loyalty programs in grocery stores?

In the competitive world of food retail, data analytics has transformed how grocery chains understand customer preferences and buying patterns. One innovation in particular revolutionized how supermarkets track consumer behavior and optimize inventory. Test your knowledge about this pivotal development in food retail history that changed how we shop for groceries forever!

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Universal Product Code (UPC) barcode scanning system, introduced in 1974 at an Ohio Marsh Supermarket with a pack of Wrigley's gum
Electronic shelf labels (ESL), first implemented by Kroger in 1985 to dynamically adjust pricing based on inventory levels
Grocery loyalty cards, pioneered by Safeway in 1981 with their 'SuperSaver' program that tracked individual purchase histories
Digital receipt technology, launched by Whole Foods in 1992 as the first paperless transaction system in American supermarkets