Which religious publishing innovation was first introduced in 1979 and revolutionized how people could listen to spiritual content while on the go?

Throughout history, religious texts have been at the forefront of publishing innovations and retail strategies. From ancient scrolls to digital platforms, the distribution of spiritual wisdom has evolved dramatically, often pioneering new retail approaches. This trivia question tests your knowledge of a significant product launch milestone in religious publishing that changed how people accessed spiritual content.

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The Sony Walkman Bible - complete audio recordings of the Bible designed specifically for Sony's new portable cassette player
Biblical Software for Apple II - the first computerized Bible concordance and search system
Pocket Prayer Books - miniaturized religious texts with waterproof covers for travelers
Scripture Radio Network - the first 24-hour radio station dedicated solely to continuous readings of religious texts