Which e-commerce innovation first allowed language learners to purchase and instantly access digital audio lessons without physical media?

The intersection of linguistics and e-commerce has transformed how language products and services are marketed and sold. From AI-powered language learning apps to translation services, the retail landscape for language tools has evolved dramatically in the digital age. This poll tests your knowledge about a significant e-commerce innovation in the language learning industry that changed how consumers access linguistic products.

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Audible's downloadable language programs (1997)
Rosetta Stone's online subscription model (2009)
Duolingo's freemium marketplace (2011)
Babbel's mobile-first purchasing platform (2008)