Which of these government digital platforms was abandoned in 2013 after costing taxpayers over $1 billion, with less than 1% of its planned functionality delivered?

Major government digital initiatives often attract significant investment and public attention. However, not all ambitious government technology platforms succeed. This trivia question tests your knowledge about notable government digital platform failures that influenced future public sector technology strategies and procurement policies.

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The UK's National Programme for IT (NPfIT) electronic health records system
The US Healthcare.gov initial launch platform
Canada's Phoenix payroll system
The US Air Force Expeditionary Combat Support System (ECSS)