Which linguistic technique was specifically employed when naming the language learning app 'Duolingo', reflecting its core purpose?

In the world of language and linguistics, brand names are carefully crafted using specific linguistic principles to evoke certain emotions and associations. Companies invest heavily in linguistic research to create names that resonate across cultures and languages. This trivia tests your knowledge about the fascinating intersection of linguistics and brand marketing strategies used by major companies to create memorable, effective brand identities.

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Compound blending: combining 'duo' (pair/two) with 'lingo' (language) to reference learning languages in pairs/together
Onomatopoeia: the name mimics the sound of conversation between two people
Back-formation: derived from 'dual dialogue' shortened to create a more memorable term
Reduplication: repeating syllable patterns (du-li-ngo) to create a rhythmic, memorable sequence