Which mathematical concept forms the foundation of Amazon's product recommendation system that drives approximately 35% of their revenue?

E-commerce platforms use sophisticated mathematical algorithms to personalize shopping experiences. These recommendation systems analyze purchase history, browsing behavior, and other data points to suggest products customers might like. But do you know which mathematical concept revolutionized online retail personalization? Test your knowledge of how mathematics powers the digital shopping experience!

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Collaborative filtering using matrix factorization
Bayesian probability networks
Neural network deep learning with convolutional layers
Markov decision processes