Which innovative brand strategy did Penguin Books pioneer in 1935 that revolutionized book publishing and accessibility?

In the publishing world, corporate logos and brand strategies have shaped how we discover and consume literature. One iconic publisher transformed the accessibility of books through innovative branding and distribution methods that revolutionized the industry in the 20th century. Test your knowledge about this transformative publishing strategy that changed how people bought and related to books worldwide.

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Color-coded book covers based on genre (orange for fiction, blue for biography, etc.)
The 'buy one, get one free' promotional model for hardcover books
First subscription-based home delivery service for new releases
Introduction of the first celebrity author endorsement program