A smiley face rendered as a single SVG graphic, composed of a yellow circle for the head, two black eyes, and an arc-shaped mouth. The visualization is built with React and D3 v5, using the `arc` API to generate the mouth's path. All elements are positioned relative to a central transform, with fixed offsets for the eyes and mouth radius, and the head is drawn with an explicit `stroke` and `stroke-width`. The code demonstrates declarative SVG construction within a React component.