Which innovative feature did Duolingo first introduce in 2020 that revolutionized their approach to conversational language learning?

Duolingo has transformed language learning through gamification and AI. As one of the most successful language learning platforms, they've pioneered various innovative features and business strategies. How well do you know the brand's approach to product development and marketing in the language learning industry? Test your knowledge about this influential language learning platform that has changed how millions approach language acquisition.

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AI-powered speaking exercises with real-time feedback
Language learning through virtual reality immersion
Peer-to-peer language exchange with native speakers
Grammar correction using blockchain verification