Which of the following best describes the function of NATO?

The function of NATO, or the North Atlantic Treaty Organization, is primarily focused on international military cooperation for dispute resolution. Established in 1949, NATO was formed as a collective defense alliance to ensure the security and defense of its member countries against potential military threats. The core principle of NATO is collective defense, which means that an armed attack against one or more of its members is considered an attack against all members. This principle aims to deter aggression and provide a framework for cooperative defense strategies.

In this context, NATO engages in various military operations and exercises to enhance the security and preparedness of member nations. The organization's role also includes conflict resolution through diplomatic means and cooperative security arrangements to maintain international peace and stability. This focus on military collaboration distinguishes NATO from organizations that address other issues like health, economics, or environmental concerns, which are not within its primary mandate.

The other options presented relate to different areas of international cooperation, none of which align with NATO's primary function.