Which e-commerce platform technology was first adapted for government use to create the initial version of USA.gov (formerly FirstGov.gov) in 2000?

Government agencies worldwide have been racing to modernize their digital services for citizens. E-commerce platforms and technologies have played a crucial role in this transformation, with some governments adopting commercial solutions while others build custom platforms. Test your knowledge about the pioneering e-commerce technologies that have shaped modern government service delivery and the digital citizen experience.

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Amazon's search technology (licensed from the company)
eBay's auction system (modified for government procurement)
Shopify's content management system (government edition)
Microsoft's Commerce Server (federal adaptation)