Which language learning company underwent a major rebranding in 2012, changing its name to reflect a linguistic term while simultaneously pivoting to a freemium mobile-first approach?

In the world of language-based products and services, branding plays a crucial role in distinguishing companies from their competitors. Linguistic companies often use clever wordplay, meaningful etymologies, or symbolic references in their brand identities. This poll tests your knowledge about a significant rebranding effort in the language learning industry that changed the market landscape. Can you identify the correct historical development?

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Duolingo (formerly von Ahn Languages)
Babbel (formerly Lesson Nine GmbH)
Rosetta Stone (formerly Fairfield Language Technologies)
Busuu (formerly Language Learning Network)