Which algorithm technique is most widely used by major e-commerce platforms for their product recommendation systems?

E-commerce giants employ sophisticated algorithms to personalize shopping experiences. These systems analyze browsing patterns, purchase history, and demographic data to recommend products that seem eerily perfect for each customer. But do you know which mathematical technique powers the most effective recommendation systems used by major retailers today? Test your knowledge of the technology driving personalized shopping experiences.

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Collaborative Filtering
Random Forest Classification
Recurrent Neural Networks
K-means Clustering