Which wildlife conservation organization first introduced the 'symbolic animal adoption' brand strategy that allows people to 'adopt' endangered animals as a fundraising mechanism?

Test your knowledge about innovative brand strategies in the wildlife conservation sector! Conservation organizations constantly evolve their branding approaches to connect with donors and raise awareness for endangered species. This question focuses on a groundbreaking strategy that revolutionized wildlife conservation fundraising and public engagement. Can you identify which famous conservation organization pioneered this approach?

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World Wildlife Fund (WWF)
The Nature Conservancy
National Audubon Society
Wildlife Conservation Society