Which linguistic phenomenon is specifically leveraged in the product naming strategy of the language learning app 'Duolingo'?

In the language and linguistics industry, product naming is a sophisticated art that combines marketing psychology with linguistic principles. Companies invest heavily in naming strategies that leverage phonetics, morphology, and semantic associations to create memorable, effective brand identities. This poll tests your knowledge about how linguistic science influences product development and branding in the language learning and translation technology market.

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Sound symbolism (the 'duo' creates a soft, approachable sound pattern while 'lingo' references language learning)
Morphological blending (combining 'dual' meaning two languages with 'monolingual' to create linguistic contrast)
Phonetic reduplication (repeating the 'l' sound to create a memorable rhythmic pattern)
Semantic transparency (using direct Latin roots 'duo' and 'lingua' without modification)