Which revolutionary product design innovation was specifically created to address the problem of portable music listeners frequently having to replace batteries while jogging?

Throughout history, certain product designs have fundamentally changed how we live, work, and play. These revolutionary inventions often emerged from identifying unmet consumer needs through market research and understanding consumer behavior. This trivia question tests your knowledge about a significant product design milestone that transformed an entire industry and our daily lives. Can you identify the correct innovation among these groundbreaking designs?

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The Sony Walkman's spring-loaded cassette holder mechanism
The Apple iPod's click wheel interface
The Sony Discman's Electronic Shock Protection (ESP) technology
The Creative Nomad's extended battery compartment design