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The association of IIS 3 (Internet Information Services 3) with Windows NT 4 is rooted in the fact that IIS 3 was specifically designed to run on Windows NT 4. This was a significant release that brought improvements and capabilities to web hosting on Windows platforms during that era.

IIS 3 represented an evolution in Microsoft's web server offerings, with features that included better support for applications, improved security measures, and enhanced performance. Windows NT 4, introduced in 1996, provided a robust operating system environment that was well-suited for enterprise applications, including web services.

In contrast, the other operating systems listed follow IIS 3 chronologically and either came with different versions of IIS or were not available during the period when IIS 3 was the relevant version. For instance, Windows 2000 launched IIS 5, while Windows XP and Windows Server 2003 proceeded to support even later versions of IIS, each with enhancements over its predecessors. Thus, the correct association with IIS 3 is Windows NT 4.