Which innovative product strategy did National Geographic implement in 1997 that helped transform the company's business model?

National Geographic magazine has been bringing the world to readers' doorsteps since 1888, with its iconic yellow border becoming one of the most recognizable brand elements in publishing history. But how well do you know the business decisions and product innovations that helped this geographic institution survive and thrive in an increasingly digital world? Test your knowledge about this famous geographic brand's product history!

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The launch of National Geographic Channel on television
The introduction of their first interactive CD-ROM atlas
The release of their first smartphone app for digital maps
The creation of National Geographic Kids magazine