Which packaging innovation revolutionized the romance novel market in the 1970s-80s, leading to a massive expansion in readership?

The publishing world has seen remarkable innovations in how books are presented to consumers. Beyond the traditional hardcover and paperback formats, publishers have experimented with various packaging designs to attract readers and enhance the reading experience. This poll tests your knowledge about a groundbreaking packaging innovation that changed how a specific genre of books was marketed to readers. Can you identify which revolutionary packaging concept genuinely transformed its literary category?

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Stepback covers (dual covers with a second revealing illustration underneath)
Clinch covers (showing embracing couples with detailed costume designs)
Embossed lettering with gold foil author names
Transparent dust jackets revealing partial illustrations