Which linguistic breakthrough significantly improved retail chatbots' ability to understand customer intent across multiple languages in 2019?

Natural language processing has transformed how retailers interact with customers through AI-powered chatbots. These virtual assistants employ sophisticated linguistic algorithms to understand context, sentiment, and intent. Behind their seemingly simple interfaces lies complex language technology that has evolved dramatically in recent years. Test your knowledge about the linguistic breakthroughs powering today's most advanced retail chatbots!

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Google's BERT (Bidirectional Encoder Representations from Transformers)
Microsoft's DialoGPT (Dialogue Generative Pre-trained Transformer)
Facebook's MBART (Multilingual Denoising Pre-training for Neural Machine Translation)
IBM's Watson Tone Analyzer for Emotional Intelligence