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The connection of the NT4 Option Pack to IIS 4 defaults is rooted in the history of Microsoft's Windows operating systems and their respective server capabilities. IIS, or Internet Information Services, was first introduced with Windows NT 4.0. The NT4 Option Pack specifically included additional features and capabilities for Windows NT 4.0, which included IIS 4.0 as part of its functionality.

IIS 4.0 served as a significant update to the previous version, offering enhanced performance and new features that catered to the needs of web hosting and application servers. When discussing defaults associated with IIS 4.0, it's essential to reference the NT4 Option Pack since that is the version that presented and integrated these defaults into a server environment.

In contrast, the other options represent different versions of the Windows operating system that either predate or postdate the advancements introduced with IIS 4.0, making them unsuitable when looking for the option pack directly linked to IIS 4 defaults. Thus, the NT4 Option Pack is the correct association.