Windows Workflow Foundation - the new user interface system was introduced with
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.NET Framework 1.1
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.NET Framework 2.0
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.NET Framework 3.0
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.NET Framework 3.5
C
Correct answer
Explanation
Windows Workflow Foundation (WF) was introduced as part of .NET Framework 3.0, along with WPF (Windows Presentation Foundation) and WCF (Windows Communication Foundation). This was a major release that introduced several new technologies for building workflow-driven applications and rich client experiences.