Which government initiative first introduced the concept of 'Government as a Platform' (GaaP) that revolutionized digital service delivery to citizens?

In the rapidly evolving landscape of government technology, certain initiatives stand out for their innovative approach to digital services. This poll tests your knowledge about groundbreaking government retail strategies and digital innovations that have transformed how citizens interact with public services. See if you can identify which government agency pioneered a revolutionary approach that has since been adopted worldwide.

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USA's Digital Services Playbook (2014)
UK's Government Digital Service (2011)
Estonia's e-Estonia initiative (2000)
Singapore's Smart Nation (2014)