Which revolutionary pricing strategy, introduced around 2008, fundamentally changed how consumers access music and became the dominant revenue model for the industry?

The music industry has undergone radical transformations in how products are priced and sold to consumers. From physical albums to digital downloads to streaming subscriptions, pricing strategies have evolved dramatically to adapt to changing technologies and consumer behaviors. This trivia question focuses on a pivotal pricing innovation that changed how music is consumed worldwide.

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The 'pay-what-you-want' model pioneered by Radiohead's 'In Rainbows' album release
The subscription-based streaming model with unlimited access for a monthly fee
Apple's standardized $0.99 per song pricing on iTunes
The 'freemium' model with ad-supported free tier and premium paid options