Which retail innovation, launched in 1994, pioneered the 'collaborative filtering' recommendation system that transformed how customers discover products online?

The retail landscape has been transformed by technological innovations that have changed how we shop and interact with products. From the earliest department stores to modern e-commerce giants, certain breakthrough innovations have redefined the shopping experience. This trivia tests your knowledge of pivotal technological developments that revolutionized retail customer experience and set new standards for the industry.

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Amazon's 'Customers Who Bought This Also Bought'
Netflix's movie suggestion algorithm
CDNOW's Automated Collaborative Filtering system
eBay's 'Similar Items' feature