When Penguin Books launched in 1935, what revolutionary brand positioning strategy did they implement that transformed the publishing industry?

In the competitive world of book publishing, brand positioning has been crucial for success. One publishing house revolutionized the industry in the 1930s with an innovative approach to making quality literature accessible to the masses. This publishing innovation changed how readers interact with books and created one of the most recognizable brand identities in literary history. Test your knowledge about this landmark development in publishing history!

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They introduced standardized color-coded covers to categorize genres (orange for fiction, green for crime, etc.)
They sold quality paperback books for the price of a pack of cigarettes (sixpence), making literature widely accessible
They pioneered the 'book club' subscription model where readers received curated monthly selections
They were the first publisher to include author photographs and biographical information on book covers