Which packaging innovation in the 15th century most dramatically increased access to religious texts and contributed to religious reformation movements?

Throughout history, religious texts have undergone significant transformations in how they're packaged, presented, and marketed to believers. From ancient scrolls to modern digital platforms, the packaging of sacred wisdom has evolved dramatically. This poll tests your knowledge about a significant packaging innovation that revolutionized how religious texts were accessed by the masses. Consider how packaging changes can democratize access to spiritual knowledge!

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Gutenberg's movable-type printing press, which made mass-produced Bibles affordable for the middle class
The development of leather-bound codex formats that replaced scrolls, making texts more durable
The introduction of illuminated manuscripts with gold leaf, creating luxury editions for wealthy patrons
The creation of pocket-sized prayer books that could be carried by traveling merchants