Which product recommendation system holds the Guinness World Record for the largest number of personalized recommendations generated in a single day?

World record achievements often spark product innovation and retail phenomena. The most successful retail products sometimes achieve astonishing world records in sales, customer adoption, or market penetration. This poll tests your knowledge of how retail analytics and product innovation have intersected with world record achievements in the global marketplace.

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

Amazon's A9 algorithm (2.3 billion recommendations)
Alibaba's 'Magic Mirror' system during Singles Day 2019 (4.8 billion recommendations)
Netflix's recommendation engine (1.9 billion recommendations)
Walmart's customer preference engine (3.5 billion recommendations)