4. Which of the following is an example of a non-tariff barrier to trade? a. quota on the amount of goods that can enter a country b. National product safety standards c. A tax levied on imported goods d. All of the above a. Mao b. Beijing leadership c. White House d. All of the above 6. Which of the following was NOT true about mutual assured destruction (MAD)? a. It relied exclusively on deterrence. b. It was based on the assumption that each side has a second strike capability c. It assumed that the threat of retaliation would deter each side from launching the first stril d. All of the above