Which famous language-focused brand launched a successful subscription-based learning platform in 2012 that uses adaptive learning algorithms to personalize vocabulary acquisition?

The intersection of linguistics and branding has created fascinating market strategies and innovations. Major dictionary and language learning companies have adapted to digital transformation while maintaining their legacy. This poll tests your knowledge about how these brands have evolved their product strategies and business models in the modern era. Do you know how these language-focused brands have transformed themselves?

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Merriam-Webster with 'Dictionary Prime'
Rosetta Stone with 'Rosetta World'
Oxford University Press with 'Oxford Language Lab'
Duolingo with its gamified language learning app