Which retail AI innovation was first widely adopted by major retailers and is considered the breakthrough that sparked the current retail AI revolution?

Artificial intelligence has transformed the retail landscape in dramatic ways over the past decade. From personalized shopping experiences to inventory management, AI continues to revolutionize how retailers operate and connect with consumers. This trivia question focuses on a pivotal moment in retail AI history that changed the industry's trajectory. Test your knowledge about the early days of AI adoption in the retail sector!

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Predictive inventory management systems that reduced stockouts by 30% (2015)
Recommendation engines that increased average order value by personalizing product suggestions (2012)
Computer vision systems for automated checkout experiences (2018)
Conversational AI shopping assistants that guided customer purchasing decisions (2016)