Which retail technology innovation was FIRST widely adopted by major religious publishers to make sacred texts more accessible to modern consumers?

The digital transformation has touched even the most traditional realms of spirituality. Religious publishers and organizations have embraced various technologies to make sacred texts more accessible in the modern retail environment. This poll tests your knowledge about how religious product retail has evolved in the digital age and the innovative approaches used to connect spiritual consumers with religious content.

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Augmented Reality (AR) scripture visualization apps
Audio Bible subscriptions on cassette tapes
QR codes linking to online theological commentaries
RFID-enabled interactive prayer books