Which groundbreaking customer feedback invention from the 1970s allowed companies to collect mass consumer opinions and is credited with saving the New Coke disaster?

The evolution of customer feedback mechanisms has revolutionized how companies develop and improve their products. Before digital surveys and social media, innovative approaches to gathering consumer opinions helped shape iconic inventions and discoveries. This poll tests your knowledge about a pivotal moment in retail feedback history that changed how companies interact with customers forever.

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The toll-free 1-800 customer service number, first widely implemented by AT&T in 1967, allowing customers to call companies for free
The Universal Product Code (UPC) barcode system, which tracked purchasing patterns to infer customer preferences
The first electronic point-of-sale (POS) systems by IBM that included customer satisfaction buttons
The Nielsen Television Rating System's 'People Meter' that tracked consumer viewing habits to guide product advertising