Which retail innovation led to the Bible becoming the first mass-market religious product in the Western world during the 15th century?

The publishing and distribution of religious texts represents a fascinating intersection of spirituality and commerce. Over the centuries, sacred books have evolved from hand-copied manuscripts to mass-market products available in countless formats and translations. This trivia question explores how consumer behavior and retail trends have transformed the accessibility and presentation of one of the world's most significant religious texts.

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Gutenberg's printing press, which allowed for mechanical reproduction instead of hand-copying
The development of door-to-door Bible salesmen by the American Bible Society
The creation of leather-bound 'family Bibles' with personalized genealogy pages
The introduction of pocket-sized editions that could be carried by traveling merchants