Which of these is the BEST example of a pure public good?

Question

Quizplus · Accepted Answer

National defense is the best example of a pure public good because it is non-excludable (everyone benefits from it, regardless of whether they pay for it or not) and non-rivalrous (one person's consumption of national defense does not reduce the amount available to others). Welfare programs, highways, and mail delivery are not considered pure public goods because they are partially excludable or rivalrous in some way.

Which of These Is the BEST Example of a Pure