Which linguistic marketing innovation did Duolingo pioneer that transformed how language learning products are marketed across different cultures?

In the competitive world of retail, language plays a crucial role in brand identity and customer engagement. Linguistic elements in marketing campaigns can make or break a product's success. This poll tests your knowledge about a groundbreaking linguistic marketing strategy that revolutionized how brands communicate with multilingual audiences. Can you identify the correct innovative approach that changed the retail landscape?

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Owl-based emotional response marketing (OBERM) - using their mascot's expressions to convey identical emotions across all languages
Contextual language progression advertising - where ads gradually increase in difficulty in the target language as they're viewed
Universal phonetic brand naming - creating product names that sound identical in pronunciation across 23 major world languages
Linguistic color psychology - developing a universal color-coding system where colors represent the same grammatical concepts in all languages