Which linguistic feature was specifically prioritized in the early product design of Amazon's Alexa to make it more user-friendly across different English dialects?

Voice assistants like Alexa, Siri, and Google Assistant have transformed how we interact with technology through natural language. Behind these interfaces are sophisticated product design decisions based on linguistic principles. Understanding these design choices reveals how companies approach the challenges of language processing and user experience. Test your knowledge about the intersection of product design and linguistics in this voice assistant trivia!

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Wake word ending with a vowel sound for better detection accuracy
Slang recognition algorithms to appear more human-like
Regional accent neutralization to standardize responses
Variable speech rate adaptation based on user's speaking tempo