Which historic retail innovation from the 1980s is widely credited as the first major customer analytics program that systematically tracked individual purchase patterns?

The retail landscape has evolved dramatically over the decades, with innovations in customer analytics reshaping how businesses understand their markets. Before sophisticated AI and machine learning tools became mainstream, retailers pioneered various methods to track customer preferences and behaviors. This trivia question explores a pivotal moment in retail history that revolutionized how businesses collected and utilized customer data, setting the foundation for today's advanced analytics systems.

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American Airlines' AAdvantage frequent flyer program (1981)
Walmart's Retail Link supplier database (1985)
Sears' Shop at Home catalog customer profiling (1984)
K-Mart's BlueLight Special customer tracking system (1983)