Which revolutionary linguistic feature was first implemented in retail chatbots by Amazon's Alexa in 2018, fundamentally changing how customers interact with online shopping platforms?

The intersection of language technology and retail has transformed customer experience dramatically. Chatbots and virtual assistants now serve as the first point of contact for many shoppers, but their linguistic capabilities have evolved significantly over time. This poll tests your knowledge about a pivotal moment in retail chatbot development that changed how we interact with online stores.

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Context-aware conversation memory that maintained dialogue history across multiple shopping sessions
Sentiment analysis that could detect customer frustration and automatically escalate to human support
Follow-up question capability without requiring wake words or repeated commands
Multilingual code-switching that allowed customers to use multiple languages in the same conversation