This example shows a simple organization graph diagram with three nodes (Alice, Bob, Carol) connected by two links, rendered as circles in an SVG container. The visualization uses d3.forceSimulation to apply force-directed layout, combining forceManyBody for repulsion, forceLink for attraction along edges, and forceCenter to keep the graph centered. The simulation updates circle positions on each tick via callbacks. The code uses d3.select to target the SVG element and appends circle elements with a radius of 30, with the force simulation driving their cx and cy attributes.