This example demonstrates a minimal setup for D3 version 6, rendering a single SVG circle with a radius of 40 pixels on a 960 by 500 canvas. The code uses the `d3.select` API to target the body element and displays the text "Hello D3 version 6" directly in the page. The visualization relies on the D3 library imported from the official CDN, with the SVG markup defined inline in the HTML and supplementary JavaScript in a separate `bundle.js` file.