Which linguistic innovation did Amazon implement in 2018 that dramatically improved Alexa's natural language processing for shopping?

Voice commerce is transforming retail through sophisticated language processing technologies. Major companies are investing heavily in natural language understanding to create seamless shopping experiences. This trivia question explores a significant breakthrough in the voice commerce space that changed how we interact with AI shopping assistants. Test your knowledge of how linguistics and retail technology are converging in this rapidly evolving field.

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Context carryover capability, allowing Alexa to maintain conversation history across multiple queries
Syntactic parsing trees that analyze grammatical structures to determine product categories
Sentiment analysis algorithms that detect customer tone to recommend appropriate products
Multilingual translation matrices enabling real-time shopping across 12 different languages