Which major change did Spotify make to their logo design in 2015 that sparked significant discussion in the design community?

Behind every successful brand in the pop culture landscape is a memorable logo that evolves with the times. Some of the most recognizable logos in the music industry have fascinating stories behind their design changes. This trivia question tests your knowledge about a famous music streaming platform's logo design evolution that marked a significant turning point in their brand identity and market positioning. Do you know enough about music brand transformations to identify the correct answer?

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They shifted from a bright green to a darker 'Spotify green' shade that's now synonymous with their brand
They removed the sound wave elements from their logo completely
They changed their logotype from serif to sans-serif font
They added headphone elements to emphasize music streaming