This example renders a static SVG smiley face using React and D3. It draws a yellow circle with a grey stroke, two grey eyes, and defines a mouth arc using the `d3.arc` API. The visualization uses React’s `ReactDOM.render` to mount the SVG into the DOM, with fixed dimensions of 960 by 500 pixels. All shapes are positioned using hard-coded coordinates and radius values, demonstrating basic React component composition for SVG output.