Which groundbreaking invention was the first product to be demonstrated in a live television broadcast in 1939, revolutionizing how new technologies would be marketed to consumers?

Throughout history, inventors and innovators have continuously sought new ways to showcase their discoveries to the world. Marketing strategies for new inventions have evolved dramatically over time, from simple newspaper ads to sophisticated multimedia campaigns. This trivia question focuses on a pivotal moment when technology and marketing converged to forever change how products would be demonstrated to the public.

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The Television itself (RCA's electronic television system)
The Bell Telephone's long-distance calling service
Ford's assembly line automobile manufacturing process
Kodak's first consumer color film technology