Which innovative marketing strategy first popularized the phrase 'language acquisition' instead of 'language learning' in consumer-facing advertisements?

The language industry has seen remarkable innovations in marketing strategies over the years. Linguistic theories and language technologies have transformed how language learning products, translation services, and language education platforms position themselves in the market. This poll tests your knowledge of a pivotal marketing strategy that revolutionized how language learning products were marketed to consumers worldwide.

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Rosetta Stone's immersion marketing campaign of 2006, which emphasized natural language acquisition similar to how children learn
Duolingo's gamification approach of 2012, which reframed language study as 'painless acquisition through play'
Berlitz's 2001 'Global Citizen' campaign that positioned language acquisition as a professional necessity
Pimsleur's audio-based marketing in 2010 that promised 'effortless acquisition' through listening