Which government agency first implemented a unified 'digital marketplace' platform that revolutionized procurement processes for both government departments and private vendors?

Test your knowledge about government retail customer engagement strategies! In today's digital age, governments worldwide are implementing innovative approaches to improve citizen services and engagement. These strategies often mirror retail customer engagement practices but with unique public sector considerations. This trivia question focuses on a pioneering digital transformation initiative that revolutionized how citizens interact with government services.

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The UK Government Digital Service (GDS) with its Digital Marketplace in 2014
The US General Services Administration (GSA) with its Acquisition Gateway in 2016
Australia's Digital Transformation Agency (DTA) with its Digital Marketplace in 2017
Estonia's Information System Authority with its e-Procurement platform in 2013