Which AI language model technique revolutionized retail chatbots around 2018-2019 by enabling more natural conversations with customers?

The intersection of language and retail technology has created fascinating innovations in how businesses communicate with customers. Natural Language Processing (NLP) has revolutionized customer service, market research, and brand storytelling. This poll tests your knowledge of how linguistic principles are applied in modern retail technologies and strategies.

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BERT (Bidirectional Encoder Representations from Transformers)
RNN (Recurrent Neural Networks)
GAN (Generative Adversarial Networks)
CNN (Convolutional Neural Networks)