Which language learning brand's advertising campaign first popularized the phrase 'Think in [language]' as a marketing approach, emphasizing immersive learning rather than translation?

The language industry relies heavily on effective advertising to promote language learning apps, translation services, and linguistic tools. Some advertising campaigns have become iconic for their clever use of language itself. This trivia tests your knowledge about a famous linguistic advertising campaign that revolutionized how language learning products were marketed to the general public.

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Rosetta Stone (1992)
Berlitz (1978)
Pimsleur (1986)
Duolingo (2012)