You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The applicatio contains a window as shown in the following exhibit.
You need to define a DockPanel control that fits the window. Which code fragment should you use?

A.
<DockPanel> <Button Content=”Left”/> <Button Content=”Top” DockPanel.Dock=”Top”/> <Button Content=”Bottom” DockPanel.Dock=”Bottom”/> <Button Content=”Center”/> </DockPanel>

B.
<DockPanel> <Button Content=”Top” DockPanel.Dock=”Top”/> <Button Content=”Bottom” DockPanel.Dock=”Bottom”/> <Button Content=”Left”/> <Button Content=”Center”/> </DockPanel>

C.
<DockPanel> <Button Content=”Left”/> <Button Content=”Top” DockPanel.Dock=”Top”/> <Button Content=”Center”/> <Button Content=”Bottom” DockPanel.Dock=”Bottom”/> </DockPanel>

D.
<DockPanel> <Button Content=”Top” DockPanel.Dock=”Top”/> <Button Content=”Left”/> <Button Content=”Center”/> <Button Content=”Bottom” DockPanel.Dock=”Bottom”/> </DockPanel>