Which retail innovation by Amazon fundamentally transformed the religious publishing industry in the early 2010s?

In our increasingly digital world, religious and philosophical texts have undergone remarkable transformations in how they're produced, marketed, and consumed. This trivia question explores a significant retail innovation that changed how spiritual seekers access ancient wisdom and contemporary religious thought. Test your knowledge about the intersection of technology, spirituality, and publishing!

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The 'Faith' category algorithm that recommended religious texts based on user preferences and reading patterns
The Kindle Direct Publishing platform allowing independent religious scholars and spiritual teachers to self-publish without traditional gatekeepers
The 'Scripture Pass' subscription service offering unlimited access to religious texts from multiple faiths for a monthly fee
The 'Sacred Texts Archive' partnership with major religious institutions to digitize rare manuscripts and make them widely available