Which of the following represents a major rebranding decision Duolingo made in 2019 that significantly impacted its visual identity?

Duolingo has revolutionized language learning with its gamified approach and distinctive brand identity. Beyond its friendly green owl mascot, the company has made strategic branding decisions that helped it become one of the most recognized language learning platforms globally. Test your knowledge about this language learning giant's brand evolution and marketing strategies that have made language acquisition more accessible to millions worldwide.

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They introduced a custom typeface called 'Feather Bold' specifically designed to work across 40+ languages
They replaced their owl mascot 'Duo' with a multilingual parrot named 'Lingo'
They changed their primary brand color from green to blue to symbolize linguistic fluidity
They adopted a voice-based logo that pronounces 'Duolingo' differently in various languages