Which linguistic phenomenon was specifically leveraged in the rebranding of the language-learning app Duolingo to increase user engagement and retention?

In the world of language and linguistics, effective branding strategies often leverage linguistic principles to create memorable products and experiences. Companies invest heavily in linguistic research to develop names, taglines, and marketing language that resonates across cultures while avoiding translation pitfalls. This poll tests your knowledge of how linguistic science influences retail branding and customer experience design in global markets.

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Gamification using linguistic rewards and the 'streak' concept to create habitual usage patterns through operant conditioning principles
Implementation of morphological analysis to personalize content based on a user's native language structure
Application of Sapir-Whorf hypothesis to restructure language acquisition pathways in the platform's architecture
Integration of phonological contrast training using minimal pairs to improve accent recognition technology