The US-led QUAD, officially known as the Quadrilateral Security Dialogue, is a strategic grouping comprising four countries. These nations are the United States, Japan, Australia, and India. Formed to promote a free, open, prosperous, and inclusive Indo-Pacific region, the QUAD focuses on cooperation across various domains, including maritime security, economic development, disaster relief, and addressing regional challenges.
Therefore, B: 4 is the correct number of member countries. Options A: 2, C: 6, and D: 8 are incorrect. The QUAD's structure is specifically defined by these four democratic nations, working collaboratively to enhance stability and prosperity in a crucial geopolitical area. Its purpose is to foster dialogue and joint initiatives among its members.