Which innovative marketing approach first made religious texts widely accessible to ordinary people in the 15th century?

Throughout history, religious texts have been among the most produced, distributed, and marketed products in human civilization. From ancient hand-copied scrolls to modern digital editions, the methods used to share these foundational philosophical works reveal fascinating insights about commerce, technology, and cultural values. This trivia question explores an innovative marketing approach that revolutionized how people access religious wisdom.

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Gutenberg's movable-type printing press, which dramatically reduced Bible production costs
The 'subscription model' where monasteries delivered hand-copied religious texts monthly to wealthy patrons
The 'illuminated manuscript' technique that added gold leaf illustrations to increase perceived value
The 'vernacular translation' business model that sold texts in local languages rather than scholarly Latin