Which major publishing merger created the 'Big Five' company that now controls both the Penguin and Random House imprints?

The publishing industry has seen significant consolidation over the past decades, with major houses merging to form powerful conglomerates that control large portions of the literary market. These mergers have dramatically reshaped how books reach readers, affecting everything from author contracts to retail distribution. Test your knowledge about one of the most significant publishing mergers in recent literary history!

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Penguin Random House (formed when Penguin Group merged with Random House in 2013)
HarperCollins Penguin (formed when HarperCollins acquired Penguin Books in 2010)
Random Hachette (formed when Hachette Book Group merged with Random House in 2015)
Simon & Schuster Random (formed when Simon & Schuster acquired Random House divisions in 2011)