Which advertising technique revolutionized language learning product marketing in the 1980s, promising users they could learn 'effortlessly' through passive listening?

In the world of language learning and linguistics, branding plays a crucial role in how companies position their products. This trivia question focuses on a revolutionary advertising technique that transformed how language learning products were marketed to the masses. Test your knowledge about this significant shift in linguistic product advertising that changed consumer perception about language acquisition difficulty.

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The Pimsleur Method's 'Speak Like a Diplomat' campaign
Berlitz's 'Think in the Language' immersion marketing
Rosetta Stone's 'Dynamic Immersion' visual technique
Subliminal Dynamics' 'Learn While You Sleep' cassette tapes