Which linguistic breakthrough in 2018-2019 revolutionized retail chatbots by enabling them to understand context in customer inquiries rather than just keywords?

In the world of retail, chatbots have transformed how companies interact with customers, especially in language-driven services. From basic keyword recognition to sophisticated natural language understanding, the evolution of retail chatbots represents a fascinating intersection of linguistics and artificial intelligence. This trivia question explores a key historical milestone in this development. Test your knowledge about how language technology has shaped modern retail experiences!

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BERT (Bidirectional Encoder Representations from Transformers)
RNN (Recurrent Neural Networks)
LUIS (Language Understanding Intelligent Service)
ELIZA (Early Natural Language Processing System)