Which machine learning algorithm was the foundation of Amazon's early product recommendation system that helped revolutionize personalized retail?

Machine learning algorithms have revolutionized how retailers suggest products to consumers. These sophisticated systems analyze vast amounts of user data to predict preferences and drive sales. But how much do you know about the actual science and mathematics behind these recommendation engines? Test your knowledge of the algorithms that shape your shopping experience!

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Collaborative Filtering
Random Forest
K-means Clustering
Gradient Boosting Machines