Which linguistic product innovation introduced the first successful 'spaced repetition' algorithm for language learning, creating a new category of adaptive vocabulary acquisition tools?

In today's global marketplace, language learning products must constantly innovate to stay competitive. One breakthrough innovation has fundamentally changed how language learning products are designed and marketed worldwide. Test your knowledge about this significant advancement that revolutionized the industry and created an entirely new product category in language acquisition tools.

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SuperMemo, launched in 1987, which pioneered the SM-2 algorithm that automatically schedules vocabulary reviews at optimal intervals
Rosetta Stone's immersion method from 1992, which eliminated translation and focused on associating images with target language words
Pimsleur's audio system from 1963, which introduced graduated interval recall for vocabulary retention through timed audio lessons
WordChamp's cloud-based flashcard system from 2001, which first implemented adaptive learning algorithms for vocabulary acquisition