Which innovative product development strategy did Gutenberg's Bible introduce that revolutionized access to religious texts in the 15th century?

Throughout history, religious texts have undergone various transformations in how they're produced, distributed, and marketed. From ancient scrolls to modern digital platforms, the 'product development' of sacred texts represents one of the longest-running retail evolutions in human history. This poll explores a fascinating aspect of how religious texts became accessible to the masses through innovative product development strategies.

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Movable type printing, allowing mass production of identical Bibles at lower costs
Subscription-based delivery of Bible chapters to homes on a monthly basis
Illustrated comic-style Biblical narratives for improved accessibility
Miniaturized pocket Bibles with magnifying glasses included in the binding