Which of the following trade barriers is an example of a tariff?A. The U.S. federal government bans all foreign-produced beef from being imported to the United States.B. The U.S. federal government places a tax on all tires imported to the United States.C. The U.S. federal government limits the amount of sugar imported to the United States.D. The U.S. federal government provides a subsidy on all corn exported from the United States.