When were the first modern-style decorative dust jackets for books introduced as a marketing tool rather than just as plain protective wrappers?

The art of book packaging has evolved dramatically over centuries, influencing both sales and reader perceptions. Modern dust jackets aren't just protective coverings—they're marketing tools that can make or break a book's commercial success. This trivia question explores a pivotal moment in the evolution of book packaging that changed the publishing industry forever. Test your knowledge about this important innovation in literary product presentation!

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1830s, when publishers began using them to advertise other titles
1920s, alongside the rise of Art Deco design and mass market publishing
1870s, when color lithography made illustrated covers commercially viable
1950s, when paperback books created a need for eye-catching displays