Which retail innovation from the 1980s is considered the foundation of modern customer analytics and personalized marketing?

Customer analytics has transformed how retailers understand and respond to consumer behavior. Before the era of big data and sophisticated algorithms, retailers relied on much simpler methods to track customer preferences and shopping patterns. One innovation in particular revolutionized retail analytics and created the foundation for modern loyalty programs and personalized marketing. Test your knowledge about this pivotal development in retail customer analytics history!

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Introduction of barcode scanners that tracked inventory movement
The supermarket loyalty card program, first launched by Tesco's Clubcard team
IBM's first retail-specific database management system
The introduction of electronic point-of-sale (EPOS) systems with customer tracking