Which language model product launch in 2020 represented a breakthrough by demonstrating emergent abilities and being the first to use a technique called 'prompt engineering'?

Language AI products have revolutionized how we interact with technology. Behind these innovations are complex linguistic principles and breakthroughs in natural language processing. This trivia question explores a significant moment in the evolution of language AI products that changed how we think about machine understanding of human communication. Test your knowledge about the development of these technologies that now power everything from customer service to content creation.

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GPT-3 by OpenAI
BERT by Google
RoBERTa by Facebook AI
T5 by Google Research