Which AI-powered retail innovation was first successfully implemented at scale in mainstream retail during the 2010s?

The integration of artificial intelligence in retail has transformed how businesses interact with customers and manage operations. From inventory management to personalized shopping experiences, AI has been a game-changer in the retail industry. This trivia question explores a pivotal moment in retail AI history that set the foundation for today's sophisticated retail technology ecosystem. Test your knowledge about the early days of retail artificial intelligence!

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Recommendation engines that analyzed purchase history and browsing behavior to suggest products
Autonomous shopping carts that followed customers throughout stores
Fully automated cashierless stores with computer vision technology
Conversational shopping assistants with natural language processing capabilities