Which NLP technique has most significantly improved multilingual customer service chatbots in the last three years?

Natural Language Processing has transformed how companies interact with customers across languages and dialects. This trivia question explores how modern linguistics technology is being leveraged by businesses to improve customer service experiences. Test your knowledge about the intersection of computational linguistics and customer support systems!

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Transformer-based models with zero-shot cross-lingual transfer capabilities
Dictionary-based translation systems with sentiment analysis
Hidden Markov Models with improved language detection
Rule-based grammar correction with regional dialect adaptation