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.
<Grid> <Grid.RowDefinitions> <RowDefinition Height=”50*” /> <RowDefinition Height=”50*” /> </Grid.RowDefinitions> <StackPanel Grid.Row=”0″> <Button>Item1</Button> <Button>Item2</Button> </StackPanel> <GridSplitter HorizontalAlignment=”Stretch” VerticalAlignment=”Center” ShowsPreview=”True” Height=”2″ /> <TextBlock Grid.Row=”1″>Please, select an item</TextBlock> </Grid>

B.
<Grid> <Grid.RowDefinitions> <RowDefinition Height=”50*” /> <RowDefinition Height=”50*” /> </Grid.RowDefinitions> <StackPanel Grid.Row=”0″> <Button>Item1</Button> <Button>Item2</Button> </StackPanel> <GridSplitter HorizontalAlignment=”Center” VerticalAlignment=”Stretch” ShowsPreview=”True” Height=”2″ /> <TextBlock Grid.Row=”1″>Please, select an item</TextBlock> </Grid>

C.
<Grid> <Grid.RowDefinitions> <RowDefinition Height=”50*” /> <RowDefinition Height=”Auto” /> <RowDefinition Height=”50*” />
</Grid.RowDefinitions> <StackPanel Grid.Row=”0″> <Button>Item1</Button> <Button>Item2</Button> </StackPanel> <GridSplitter Grid.Row=”1″ HorizontalAlignment=”Stretch” VerticalAlignment=”Center” ShowsPreview=”True” Height=”2″ /> <TextBlock Grid.Row=”2″>Please, select an item</TextBlock> </Grid>

D.
<Grid> <Grid.RowDefinitions> <RowDefinition Height=”50*” /> <RowDefinition Height=”Auto” /> <RowDefinition Height=”50*” /> </Grid.RowDefinitions> <StackPanel Grid.Row=”0″> <Button>Item1</Button> <Button>Item2</Button> </StackPanel> <GridSplitter Grid.Row=”1″ HorizontalAlignment=”Center” VerticalAlignment=”Stretch” ShowsPreview=”True” Height=”2″ /> <TextBlock Grid.Row=”2″>Please, select an item</TextBlock> </Grid>