Which linguistic phenomenon did Duolingo specifically leverage when naming their language learning platform?

In the world of language products and services, brand naming psychology plays a crucial role in consumer perception and market success. Companies invest heavily in linguistic research to create names that resonate with their target audiences. This poll tests your knowledge about how language brands leverage linguistic psychology to create memorable identities and influence consumer behavior.

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Reduplication (repeating sounds like 'duo-duo') to create a playful, memorable quality
Morphological blending of 'dual' and 'lingo' to imply learning two languages simultaneously
Onomatopoeia to mimic the sound of a language teacher's approval
Back-formation from 'dialogue' to suggest conversational learning methods