Which language learning company pioneered 'color-coding phonetics' on their packaging, a design innovation that revolutionized how pronunciation guides were visually represented to consumers?

In the world of language products and learning tools, packaging design plays a crucial role in attracting consumers and communicating brand values. Some linguistic product companies have created revolutionary packaging that changed how language learning materials are presented and marketed. This poll tests your knowledge of significant packaging innovations in the linguistics industry that influenced consumer engagement with language learning products.

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Rosetta Stone with their 'Spectrum Speech' system (2003)
Phonolingual with their 'Chromatic IPA' packaging (1997)
Berlitz with their 'Sound Spectrum' visual system (2001)
Linguaphone with their 'Tonal Gradient' packaging (1999)