Which language model innovation first demonstrated the ability to perform multiple language tasks without task-specific training, revolutionizing retail customer service automation?

Natural Language Processing (NLP) has transformed how we interact with technology and analyze communication patterns. As language technologies advance, they're reshaping retail customer service, market analysis, and consumer engagement. Test your knowledge about a significant milestone in NLP development that has had profound implications for the language industry and retail technology applications.

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GPT (Generative Pre-trained Transformer) architecture
LSTM (Long Short-Term Memory) networks
Word2Vec embedding technique
BERT (Bidirectional Encoder Representations from Transformers)