Which famous invention from the 1970s was directly created in response to customer feedback and revolutionized how people interact with electronic products?

Throughout history, many groundbreaking products were developed based on customer feedback and market needs. Behind some of the world's most revolutionary inventions are fascinating stories of how inventors responded to consumer demands and pain points. This trivia tests your knowledge about a particularly influential invention that transformed how companies gathered and implemented customer feedback, forever changing the product development landscape.

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The graphical user interface (GUI) developed at Xerox PARC
The VHS videocassette recorder by JVC
The Sony Walkman portable cassette player
The Motorola DynaTAC mobile phone