Which marketing strategy first popularized the concept of 'language fluency in 3 months' and created a new consumer expectation benchmark in the language learning industry?

The language services industry has experienced remarkable growth in recent years, with translation, localization, and language learning platforms implementing various marketing strategies to attract customers. This poll explores one particularly successful marketing approach that revolutionized how language products are sold to consumers worldwide. Test your knowledge of linguistic product marketing innovations!

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Rosetta Stone's immersion-based marketing campaign (1992)
Benny Lewis's 'Fluent in 3 Months' blog and subsequent product ecosystem (2009)
Duolingo's gamification-based 'streak' system (2011)
Pimsleur's '30 minutes a day' audio learning advertisements (1980s)