The Parties agree that an armed attack against one or more of them in Europe or North America shall be considered an attack against them all and consequently they agree that, if such an armed attack occurs, each of them, in exercise of the right of individual or collective self-defense recognized by Article 51 of the Charter of the United Nations, will assist the Party or Parties so attacked by taking forthwith, individually and in concert with the other Parties, such action as it deems necessary, including the use of armed force, to restore and maintain the security of the North Atlantic area. North Atlantic Treaty, April 4, 1949 6.Which action was a later response to the organization created by this treaty? A. formation of the Warsaw Pact B. announcement of the Marshall Plan C. falling of the "Iron Curtain" over Eastern Europe D. application of the Eisenhower Doctrine to Lebanon