Which machine learning technique is primarily responsible for the 'customers who bought this also bought' recommendation systems widely used in scientific equipment and research supply e-commerce platforms?

Personalization algorithms have revolutionized how retailers approach customer engagement in the digital age. By leveraging vast amounts of behavioral data and advanced computational methods, retailers can create uniquely tailored shopping experiences. This poll tests your knowledge about the scientific foundations behind modern retail personalization systems that are reshaping customer experiences worldwide.

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Collaborative filtering
Reinforcement learning
Generative adversarial networks (GANs)
Random forest classification