Which product launch strategy was primarily responsible for Apple's iTunes Store becoming the dominant digital music retailer within its first year (2003-2004)?

The music industry has seen countless product launches over the decades, from revolutionary formats to groundbreaking distribution models. The most successful launches often employed innovative strategies that disrupted the status quo. This trivia question tests your knowledge of a particularly successful product launch strategy that changed how music reached consumers. Can you identify which approach truly revolutionized the industry?

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Celebrity endorsements from major artists like U2 and Eminem
The 99-cent per song pricing model that undercut traditional album sales
Exclusive album releases not available on physical media for the first month
Free music streaming for the first 30 days to build the user base