What was the first version of Windows to be offered with upgrade pricing?

What was the first version of Windows to be offered with upgrade pricing?

• Windows 3.0
• Windows 98
• Windows 2.0
• Windows NT 

EXPLANATION

 Microsoft Windows NT Workstation version 4.0 will be available within the next month for approximately $319. The price for customers upgrading from previous versions of Windows NT Workstation is approximately $149. For customers who have inadvertently used Windows NT Workstation 3.x as a server (with more than 10 inbound connections), a special promotional upgrade to Windows NT Server 4.0 is available for 90 days at $409.

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