Which description best explains a libertarian’s views on the proper scope of government?

Which description best explains a libertarian’s views on the proper scope of government?

• Government’s legitimate role is the regulation of property, which includes keeping the environment clean.
• Government’s legitimate role is the protection of our education system and using the military to spread democracy around the world.
•  Government’s legitimate role is the protection of property.
•  Government’s legitimate role is the protection of property through strict maintenance of law and order, including regulation.