Which innovative product design feature did Zondervan introduce in 1991 that revolutionized Bible publishing and significantly increased market penetration among younger demographics?

In the intersection of spirituality and commerce, religious publishing houses have developed unique product design and branding strategies to make ancient texts accessible to modern audiences. This poll explores how one major religious publisher revolutionized their market approach through innovative product design. Test your knowledge about how sacred texts have been marketed and designed for contemporary spiritual seekers.

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The NIV Study Bible with application notes and contextual explanations
The first digital Bible app with integrated commentary and social sharing features
The NIV Teen Study Bible with contemporary design, Q&A sections, and youth-focused notes
The modular Bible with removable books allowing customized spiritual study paths