Which major corporate acquisition significantly changed National Geographic's business model in 2015?

National Geographic, one of the world's most recognizable geography-focused brands, has undergone significant transformations throughout its history. From its origins as a scholarly society to becoming a global media powerhouse, National Geographic has maintained its iconic yellow border while adapting to changing media landscapes. Test your knowledge about this famous geography brand that has brought the world's wonders to millions of homes for over a century.

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The Walt Disney Company's acquisition of 21st Century Fox (which owned National Geographic)
Amazon's purchase of a controlling stake in National Geographic's digital platforms
Google's acquisition of National Geographic's mapping technology division
Apple's partnership to exclusively distribute National Geographic content on Apple TV+