Which retail technology innovation holds the Guinness World Record for the largest increase in customer retention rate within a 6-month implementation period?

The retail industry has seen its share of remarkable achievements that have earned places in the Guinness World Records. From massive store openings to extraordinary customer service feats, retailers continually push boundaries. This trivia tests your knowledge about the intersection of retail technology and world records - do you know which retail tech innovation broke a world record for its impact on customer retention?

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

Amazon's recommendation engine algorithm (2018)
Alibaba's FashionAI smart mirror system (2020)
Walmart's inventory management AI (2019)
Target's personalized mobile app experience (2021)