Which language learning brand first used the slogan "The fastest way to learn a language guaranteed™" in their marketing?

In the world of language learning and linguistics, certain brands have dominated with memorable marketing campaigns and slogans. These companies have shaped how we approach language learning and translation services over decades. This trivia question focuses on iconic brand slogans that revolutionized the language education and technology industry. Can you identify which slogan belongs to which pioneering language brand?

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Rosetta Stone
Pimsleur
Duolingo
Babbel