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The version that corresponds to NT 3.5 is indeed Windows NT 3.5 itself. Windows NT 3.5 was a significant release in the Windows NT family, introducing various enhancements over its predecessor, NT 3.1. This version focused on improving support for networking, printing, and added new features like the improved file system.

In the context of the other options, Windows NT 4.0 represents a later iteration, released after NT 3.5, and brought a new user interface based on Windows 95 as well as better multimedia capabilities. Windows 2000 is a further evolution in the Windows NT line, succeeding NT 4.0 and incorporating extensive changes to both the user experience and administration features. Windows NT 3.51 is also a subsequent release that improved upon NT 3.5, adding support for new hardware and network protocols but is not directly the version that corresponds to NT 3.5.

Thus, the correct connection is made by recognizing that Windows NT 3.5 explicitly refers to that particular version of the operating system.