The purpose of the North Atlantic Treaty Organization (NATO) is common defense.
The purpose of the North Atlantic Treaty Organization (NATO) is common defense. NATO is an alliance of 30 member countries from North America and Europe who have come together to promote peace and security in the North Atlantic region. The organization was established in 1949 with the primary goal of collective defense against any external threat to any member country. So, out of the options you provided, the correct answer is "common defense."
