Which language learning company pioneered the 'free forever' business model with a freemium approach that revolutionized the industry's marketing strategy?

The language learning industry has been transformed by innovative marketing strategies over the past decade. Companies have employed unique approaches to brand positioning, customer engagement, and product differentiation. This poll tests your knowledge about a groundbreaking marketing campaign that changed how language learning products are promoted to consumers worldwide.

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Duolingo
Rosetta Stone
Babbel
Pimsleur