Which AI language model breakthrough in 2018 revolutionized the NLP product landscape by introducing a transfer learning approach that significantly reduced the need for task-specific training data?

The field of Natural Language Processing (NLP) has transformed how we interact with technology and analyze language data. This revolution has created entirely new product categories and marketing approaches in the language technology industry. Test your knowledge about a pivotal moment in NLP's recent history that changed how language products are developed and marketed worldwide.

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BERT (Bidirectional Encoder Representations from Transformers)
Word2Vec
GloVe (Global Vectors for Word Representation)
ELMo (Embeddings from Language Models)