Which mathematical model forms the foundation of Amazon's original recommendation system that revolutionized online retail?

In the world of retail, mathematics has revolutionized how products are recommended to customers. Modern recommendation systems leverage complex algorithms to analyze purchasing patterns and suggest products that align with customer preferences. These systems have dramatically increased sales conversion rates and enhanced customer satisfaction across various retail sectors. Test your knowledge about the mathematical foundations behind these powerful retail tools!

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Markov Decision Processes
Item-to-Item Collaborative Filtering
Neural Network Deep Learning
Bayesian Probability Networks