Which major literary publishing house is known for its distinctive orange spines on its classic literature series that became an iconic part of bookstore aesthetics?

Publishing houses often develop distinct brand identities through consistent color schemes that become synonymous with their literary offerings. These visual signatures help readers instantly recognize books from their favorite publishers on bookstore shelves. Test your knowledge about the distinctive color palettes that have become iconic in the world of literature and publishing!

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Penguin Books (with their Penguin Classics line)
HarperCollins (with their Perennial Classics line)
Random House (with their Everyman's Library series)
Oxford University Press (with their World's Classics series)