Which linguistic phenomenon posed the biggest initial challenge for early voice commerce systems like Amazon's Alexa?

Voice-activated shopping has transformed e-commerce platforms through advanced language processing technologies. This new retail frontier blends linguistics with digital commerce in unprecedented ways. Test your knowledge about how language technology has revolutionized the shopping experience and created new challenges for linguists, developers, and marketers alike.

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Homonyms (words that sound the same but have different meanings)
Regional accents and dialectal variations
Grammatical errors in spoken requests
Technical vocabulary recognition