Which major language learning company rebranded from 'Rosetta Stone Ltd.' to 'Cambium Learning Group' after acquisition, retaining 'Rosetta Stone' only as a product line?

In the world of language and linguistics, company names and brand identities often evolve to meet changing market demands, expand globally, or overcome negative associations. Some rebranding efforts become case studies in how language and perception intersect in the commercial world. This poll tests your knowledge about a significant linguistic rebranding case that fundamentally changed how a major language services company was perceived.

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Duolingo
Babbel
Rosetta Stone Inc.
Berlitz