Which innovative marketing strategy, first widely implemented in the 1910s, allowed customers to physically interact with products before purchasing, dramatically changing retail history?

In the world of retail and marketing history, some strategies fundamentally changed how products were sold and perceived. This poll explores one of the most significant marketing innovations of the early 20th century that revolutionized how consumers interact with products. Test your knowledge of this pivotal moment in retail history that continues to influence modern marketing approaches worldwide.

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Self-service shopping (allowing customers to select their own merchandise without clerk assistance)
Money-back guarantee policy (pioneered by major department stores)
Product sampling stations (offering free trials of new merchandise)
Installment payment plans (allowing customers to pay for goods over time)