Which company's digital assistant was first to incorporate contextual conversation memory, allowing it to remember previous questions in a conversation thread?

Voice-activated assistants have transformed how we interact with technology, but they've also presented unique challenges and innovations in the field of computational linguistics. From natural language processing to semantic understanding, these products represent cutting-edge applications of linguistic theory and research. This poll tests your knowledge about how major brands have approached the development of their AI assistants' language capabilities.

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Apple's Siri (2013)
Google's Assistant (2016)
Amazon's Alexa (2014)
Microsoft's Cortana (2015)