Which pioneering technology, first implemented in 1994, is widely credited as the foundation of modern retail personalization algorithms?

Before AI and big data became mainstream, retail personalization was taking its first steps toward transforming how consumers shop. This trivia question explores a pivotal innovation in retail personalization algorithms that changed how retailers approach customer experience. Test your knowledge of the technological milestones that shaped modern retail personalization strategies!

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Amazon's item-to-item collaborative filtering system
Walmart's customer purchase pattern recognition software
IBM's 'Smart Shopping' customer behavior predictor
eBay's bidding behavior analysis engine