A yellow, smiling face rendered as SVG via React 17 and D3 v7. The code composes reusable React components—`BackgroundCircle`, `Eyes`, and `Mouth`—to build the face from primitive circular shapes and a D3 arc path generated with `arc()`. The `Mouth` component uses `innerRadius`, `outerRadius`, `startAngle`, and `endAngle` to define its curved shape. All elements are centered and drawn dynamically using provided prop values for dimensions and positioning.