Which product design innovation was specifically created to solve the problem of 'feature creep' and introduced the revolutionary 'click wheel' interface?

Throughout history, certain product design innovations have fundamentally changed how we interact with everyday objects. These breakthroughs often challenged conventional thinking and solved problems in unexpected ways. This trivia question tests your knowledge about a particularly influential design innovation that transformed an entire industry and how we think about user experience.

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The original iPod (2001)
The Walkman TPS-L2 (1979)
The Palm Pilot 1000 (1996)
The BlackBerry 850 (1999)