Which revolutionary marketing innovation helped Thomas Edison's electric light bulb achieve widespread adoption despite fierce competition from gas lighting companies?

Throughout history, certain product marketing strategies have revolutionized how inventions reach the public. Some marketing innovations were so groundbreaking that they fundamentally changed how consumers interact with products, creating entirely new market segments or methods of consumer engagement. This poll tests your knowledge about pivotal moments in marketing history that helped transform notable inventions from mere curiosities into household staples.

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Edison's creation of the first electrical utility company that gave away light bulbs at low cost while charging for electricity usage
A celebrity endorsement campaign featuring famous theater actors demonstrating the safety of electric lighting
Edison's national newspaper campaign offering free home installation to the first 10,000 customers
The introduction of a subscription model where customers received monthly bulb replacements for a flat fee