Which linguistic feature represented a breakthrough in making retail voice commerce systems more natural and conversational around 2019-2020?

Voice commerce is rapidly transforming retail experiences through advanced language processing technologies. Behind these convenient interfaces lie complex linguistic algorithms that analyze speech patterns, interpret regional dialects, and process semantic meaning. This poll tests your knowledge about how linguistic principles are applied in modern retail voice commerce systems to create more natural and effective customer interactions.

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Anaphora resolution (the ability to understand pronouns like 'it' or 'that one' referring to previously mentioned products)
Basic speech-to-text conversion (the ability to convert spoken words to written text)
Language identification (the ability to detect which language the customer is speaking)
Phoneme recognition (the ability to identify the individual sound units that make up words)