Which marketing innovation is credited with making the Bible the most widely distributed book in history, surpassing 5 billion copies sold?

In the world of religious literature and philosophy, marketing strategies have evolved significantly over time. One particularly innovative campaign revolutionized how sacred texts were distributed and made accessible to the masses. This poll tests your knowledge about a groundbreaking product marketing approach that dramatically increased the accessibility of philosophical and religious texts in the modern era.

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The Gideons International's free hotel Bible placement program
Thomas Nelson's 'One Hour Bible' condensed format with modern language
Zondervan's 'Bible in 90 Days' reading program with companion mobile app
Oxford University Press's multilingual parallel text editions