You are creating a Windows Presentation Foundation application by using Microsoft .NET Framework 3.5.
You add a window that displays a Button control. You need to ensure that the Button control displays an ellipse that occupies the entire button control area.
Which code fragment should you use?

A.
<Button MinHeight="20">
<VisualBrush>
<VisualBrush.Visual>
<Ellipse Width="12.5" Height="25" />
</VisualBrush.Visual>
</VisualBrush>
</Button>

B.
<Button MinHeight="20">
<Button.Background>
<VisualBrush>
<VisualBrush.Visual>
<Ellipse Width="12.5" Height="25" />
</VisualBrush.Visual>
</VisualBrush>
</Button.Background>
</Button>

C.
<Button MinHeight="20">
<GeometryDrawing>
<GeometryDrawing.Pen>
<Pen Thickness="1" Brush="Black" />
</GeometryDrawing.Pen>
<GeometryDrawing.Geometry>
<EllipseGeometry RadiusX="12.5" RadiusY="25" />
</GeometryDrawing.Geometry>
</GeometryDrawing>
</Button>

D.
<Button MinHeight="50">
<Button.Background>
<DrawingBrush>
<DrawingBrush.Drawing>
<GeometryDrawing>
<GeometryDrawing.Pen>
<Pen Thickness="1" Brush="Black" />
</GeometryDrawing.Pen>
<GeometryDrawing.Geometry>
<EllipseGeometry RadiusX="12.5" RadiusY="25" />
</GeometryDrawing.Geometry>
</GeometryDrawing>
</DrawingBrush.Drawing>
</DrawingBrush>
</Button.Background>
</Button>