Which innovative launch strategy did Duolingo use that contributed to its rapid early growth in the language learning market?

The language technology market has seen numerous revolutionary product launches that transformed how we communicate and learn languages. From speech recognition to translation tools, companies have employed various launch strategies to capture market attention and establish their brands. Test your knowledge about some of the most significant language product launches in recent history and the strategies that made them successful.

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A celebrity-filled red carpet event featuring multilingual celebrities demonstrating the app
A 'freemium' model with a waitlist system that created scarcity and drove word-of-mouth marketing
Exclusive launch partnerships with major universities offering course credit for app completion
Television infomercials featuring before-and-after testimonials from language learners