Which music product development milestone in 2001 marked the beginning of mainstream digital music consumption and later influenced the shift toward streaming services?

The music industry has undergone massive transformations through technological innovation. From vinyl records to streaming platforms, product development has shaped how we consume music. This trivia question focuses on a pivotal moment in digital music product development that revolutionized the industry and consumer behavior. Test your knowledge of music industry history!

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The launch of Apple's iPod with the tagline '1,000 songs in your pocket'
The release of Napster's paid subscription service after legal battles
Sony's introduction of the Network Walkman with proprietary ATRAC format
Microsoft's release of the Zune digital media player and marketplace