Which innovative product format, introduced by Penguin Books in 1935, revolutionized publishing by making quality literature affordable to the masses and created the modern paperback market?

In the world of publishing, marketing innovations have dramatically changed how books reach readers. One revolutionary product innovation in the literary world completely transformed book sales and created the modern concept of the 'bestseller.' This poll tests your knowledge about a pivotal moment in literary product marketing that democratized reading and created a new category of popular literature.

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Penguin Paperbacks: color-coded, affordable books priced at sixpence (the same price as a pack of cigarettes)
Penguin Pocket Editions: small hardcovers with removable dust jackets designed for wartime portability
Penguin Illustrated Classics: books featuring commissioned artwork to attract younger readers
Penguin Subscription Service: monthly book deliveries with exclusive author interviews