A smiley face rendered as an SVG inside a React component, built with D3’s `arc` generator to create the mouth path. The face consists of a yellow circle with a black stroke, two eyes positioned via fixed offsets, and a mouth drawn using `d3.arc` with specified inner and outer radii and angular extents. The code imports `arc` from the `d3` module, uses React 16.9 for rendering, and relies on D3 v5.11.0. The entire graphic is positioned using a group transform centered on the SVG viewport.