Windows Presentation 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 Presentation Foundation (WPF) was introduced with .NET Framework 3.0 as part of the WinFX technologies. WPF provides a unified programming model for building modern Windows applications with separation between UI and logic. .NET Framework 3.0 also included Windows Communication Foundation (WCF) and Windows Workflow Foundation (WF). .NET 3.5 added additional features but WPF was already there.