Which pioneering retail data discovery famously revealed the unexpected correlation between beer purchases and diaper sales, leading to a revolution in market basket analysis?

The intersection of data analytics and retail has led to revolutionary discoveries that transformed how businesses understand and serve customers. Behind today's personalized shopping experiences and targeted marketing campaigns lie groundbreaking analytical approaches that were once considered impossible. This trivia question explores a pivotal moment when retail data analytics fundamentally changed the industry landscape and revealed unexpected consumer behavior patterns.

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Target's pregnancy prediction algorithm (2002)
The Walmart/beer-diapers correlation (1992)
Amazon's collaborative filtering recommendation system (1998)
Tesco's Clubcard loyalty analytics program (1995)