Which machine learning application was the first to be widely adopted by major retailers in the early 2010s, revolutionizing their business operations?

Machine learning has transformed the retail landscape, creating personalized shopping experiences and revolutionizing inventory management. But do you know which AI application first made significant inroads in the retail sector? Test your knowledge about the pioneering technologies that shaped modern retail analytics and prediction models. This question explores the early adoption of machine learning in retail that set the foundation for today's sophisticated retail AI ecosystems.

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Recommendation engines that analyzed purchase history to suggest products
Facial recognition systems for personalized in-store experiences
Automated checkout systems using computer vision
Voice shopping assistants integrated with mobile apps