Which technological innovation is considered the foundation of modern retail customer analytics that revolutionized how businesses track consumer behavior?

The evolution of retail analytics has transformed how businesses understand customer behavior. One pivotal technological breakthrough in particular revolutionized how retailers track, analyze, and respond to customer shopping patterns. This innovation changed the face of retail forever, creating new possibilities for personalization and inventory management. Can you identify which groundbreaking technology first enabled sophisticated retail customer analytics?

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The barcode scanner, invented by Norman Joseph Woodland and Bernard Silver in 1952, first implemented in retail by IBM in 1973
Electronic cash registers with data storage capabilities, pioneered by NCR Corporation in 1974
Radio-frequency identification (RFID) tags, developed by Charles Walton in 1983 for inventory tracking
Customer loyalty cards with magnetic strips, first launched by American Airlines' AAdvantage program in 1981