Which scientific breakthrough in retail data analytics first enabled real-time personalized recommendations based on neural network processing of consumer behavior?

The intersection of science and retail has revolutionized how businesses understand consumer behavior. Advanced data analytics has transformed decision-making processes across the retail sector, allowing for unprecedented insights into purchasing patterns and customer preferences. Test your knowledge about a significant milestone in the evolution of retail data analytics that changed how scientific principles are applied to consumer behavior analysis.

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IBM's Watson Retail implementation (2011)
Amazon's Item-to-Item Collaborative Filtering algorithm (2003)
Walmart's Supply Chain Optimization System (2007)
Target's Pregnancy Prediction Analytics (2009)