Which NLP technique revolutionized retail chatbots in 2018-2019 by enabling them to better understand context in customer queries?

Natural Language Processing (NLP) has transformed how retailers interact with customers through advanced chatbots. These AI assistants help with everything from product recommendations to language translation services. But how much do you know about the cutting-edge linguistic technology powering today's retail chatbots? Test your knowledge about the intersection of computational linguistics and retail customer service in this challenging trivia question!

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BERT (Bidirectional Encoder Representations from Transformers)
RNN (Recurrent Neural Networks)
LSA (Latent Semantic Analysis)
Word2Vec