What is the relationship between the average inventory and the in-stock probability?

Governments sometimes erect barriers to trade other than tariffs and quotas. which of the following is not an example of this type of trade barrier? a. a requirement that the employees of domestic firms that engage in foreign trade pay income taxes b. restrictions on imports for national security reasons c. a requirement that imports meet health and safety requirements d. a requirement that the u.s. government buy military uniforms only from u.s. manufacturers