Which marketing innovation by Gideons International revolutionized Bible distribution in the 20th century?

In the world of religious publishing, marketing strategies have evolved significantly over time. Religious texts are among the oldest and most consistently published products in human history, requiring innovative approaches to reach new generations of readers while respecting traditions. This poll tests your knowledge about a groundbreaking marketing strategy that transformed how religious texts were distributed and consumed in the modern era.

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Placing free Bibles in hotel rooms worldwide
Creating the first subscription-based Bible delivery service
Developing the first illustrated children's Bible with marketing tie-ins
Introducing the first digital Bible application with in-app purchases