When Duolingo launched in 2012, what innovative product strategy helped it rapidly gain millions of users in the language learning market?

The language learning app market has transformed how people acquire new languages. Among the most successful apps is Duolingo, known for its gamified approach and iconic green owl mascot. This poll tests your knowledge about Duolingo's innovative product launch strategy that helped it achieve widespread adoption and create a new paradigm in language education technology. See if you can identify the key factor that set Duolingo apart from competitors during its crucial early growth phase.

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It was the first app to use speech recognition for pronunciation feedback
It pioneered the 'freemium' model where all language content was free, monetizing through ads and an optional subscription
It was the first language app to partner with major universities for credit-bearing courses
It introduced the first AI-powered language tutor that adapted to individual learning styles