This example renders a simple, stylized smiling face as an SVG graphic using React and D3.js (v7). The face is composed of a yellow circular head with a black outline, two black eyes positioned symmetrically, and a curved mouth created with D3's `arc()` function, which defines the mouth's inner and outer radii and angular range. The drawing is centered within an 960x500 viewBox, with all coordinates calculated relative to the center point via a `transform` translation. The code uses React's component model to declaratively construct the SVG elements, while D3 provides the geometric path for the mouth arc.