Which groundbreaking NLP product design approach first successfully implemented 'contextual embeddings,' revolutionizing language understanding by considering words in their full context?

Natural Language Processing (NLP) has transformed how we interact with technology and language products. From basic spell checkers to sophisticated AI assistants that can write poetry, the design evolution of language tools has been remarkable. This poll tests your knowledge about a pivotal moment in language product design history that changed how we interact with text.

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Google's BERT (Bidirectional Encoder Representations from Transformers)
Apple's Siri natural language interface
Microsoft's rule-based Grammar Checker
IBM's statistical machine translation system