International security measures are the actions and strategies that countries, states, and alliances take to make the world safe for all. International security is an opportunity to build peace through global cooperation and to protect all from harm and terror. Such protection can be achieved through diplomacy, treaties, negotiations, alliances, sanctions, conventions, and military action. The collectivities of the United Nations, the North Atlantic Treaty Organization and the (former) Warsaw Pact are examples of countries coming together to foster mutual survival and safety. As also understood from the information given, the correct answer is E.