This example shows a simple smiley face rendered as an SVG graphic. It uses React to define the component structure and D3’s `arc` generator to create the mouth path. The face consists of a yellow circle with a black stroke, two smaller circles for eyes, and a semicircular mouth drawn using an arc with specified inner and outer radii. All elements are positioned within a centered `<g>` group, and the code relies on fixed numeric coordinates for the layout.