Which innovative marketing strategy did Radiohead use in 2007 for their album 'In Rainbows' that disrupted traditional music retail models?

The music industry relies heavily on strategic marketing and brand positioning to connect artists with their target audiences. Behind every successful musician or band, there's often a brilliant marketing strategy that helped establish their unique place in the market. This poll tests your knowledge of notable music industry marketing techniques that have shaped how artists are promoted and positioned in this competitive landscape.

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They released the album as a 'pay-what-you-want' digital download, allowing fans to decide the value of the music
They released the album exclusively on vinyl to capitalize on the analog revival trend
They distributed free copies with major newspapers to maximize physical distribution
They released the album exclusively through a custom-built mobile app with interactive content