Which language learning product's 1980s marketing campaign popularized the phrase 'The method works, or you don't pay' and revolutionized how language products were marketed to consumers?

In the world of language learning products and services, marketing campaigns often shape how we perceive different approaches to language acquisition. This trivia question explores a significant marketing moment that changed the landscape of language learning products and influenced how companies position their offerings to consumers. Test your knowledge of product history in the linguistics industry!

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Rosetta Stone
Pimsleur Language Programs
Berlitz Method
Michel Thomas Method