单项选择题
You use Microsoft .NET Framework 4 to create a Windows ……
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You plan to create a window that has a layout as shown in the following exhibit.
You need to define the code fragment to create the window layout. You also need to ensure that the window contains a splitter line.
Which code fragment should you use?（）
A.
B.
C.
D.
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