Which innovative product marketing strategy first popularized the concept of 'free distribution' of religious texts that later became a cornerstone of modern religious outreach?

In the world of religious publishing and sacred text distribution, product marketing strategies have evolved dramatically in the digital age. Modern religious organizations now employ sophisticated marketing techniques to make ancient wisdom accessible to contemporary audiences. This poll tests your knowledge about a groundbreaking product marketing approach that revolutionized how sacred texts are distributed globally.

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The Gideons International's hotel Bible placement program (1908)
Vatican Radio's multilingual broadcast system (1931)
The Mormon Church's door-to-door missionary program (1830s)
The Buddhist Publication Society's sponsored text distribution (1958)