Which AI language model was first widely adopted by retail chatbots around 2018-2019, dramatically improving natural language understanding in customer service?

Language technology is transforming retail customer service in unprecedented ways. From automated translation for international shoppers to sophisticated chatbots that understand contextual queries, linguistic AI is revolutionizing how brands communicate with consumers. This poll tests your knowledge about a groundbreaking retail language technology that changed how customers interact with online stores.

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BERT (Bidirectional Encoder Representations from Transformers)
GPT-2 (Generative Pre-trained Transformer 2)
ELMO (Embeddings from Language Models)
T5 (Text-to-Text Transfer Transformer)