Which pioneering technology company first implemented collaborative filtering for product recommendations in retail, leading to the modern recommendation systems used by e-commerce giants today?

Modern retail has been transformed by technological innovations that personalize the shopping experience. Among these, recommendation systems have revolutionized how we discover products online. This poll tests your knowledge about the historical development of retail recommendation systems, which merged computer science with consumer behavior to create the personalized shopping experiences we now take for granted.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Amazon with its 'Customers Who Bought This Also Bought' feature (1998)
Netflix with its movie recommendation algorithm (2000)
GroupLens Research Lab at University of Minnesota (1992)
eBay with its 'Similar Items' feature (1997)