Which innovative marketing strategy did Thomas Edison use to demonstrate the practical value of his electric light bulb invention to the public in 1879-1880?

Throughout history, some of the world's greatest inventions succeeded not just because of their technical brilliance, but because of revolutionary marketing strategies that introduced them to the world. This poll tests your knowledge about how certain groundbreaking products were first marketed to the public, transforming from laboratory curiosities into household essentials.

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He illuminated his entire Menlo Park laboratory compound with electric lights for public viewing, creating the world's first electrical light display
He took out full-page newspaper advertisements showing detailed technical diagrams of how his bulb was superior to gas lighting
He distributed free sample bulbs to influential politicians and business leaders across America
He created a traveling exhibition that compared the brightness of various lighting technologies in a darkened theater