Which publishing innovation was first widely used for mass distribution of the Bible in the 1450s, revolutionizing religious text accessibility?

Throughout history, religious texts have been distributed in various ways, using different marketing strategies and innovations. Publishers of sacred texts pioneered many techniques we see in modern retail and publishing. This poll tests your knowledge about the fascinating intersection of faith traditions and product distribution strategies that helped shape religious publishing as we know it today.

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Gutenberg's movable type printing press
Subscription-based delivery systems
Leather-bound collector editions
Illuminated manuscript mass production