The correct answer is D. All of these.
The World Trade Organization (WTO) is an intergovernmental organization that regulates and facilitates international trade. It is the only international organization dealing with the rules of trade between nations. The WTO officially came into existence on January 1, 1995, replacing the General Agreement on Tariffs and Trade (GATT), which had been in operation since 1948.
The WTO has three main bodies: the Ministerial Conference, the General Council, and the Dispute Settlement Body. The Ministerial Conference is the highest decision-making body of the WTO. It is composed of representatives from all member countries and meets at least once every two years. The General Council is the second highest decision-making body of the WTO. It is composed of representatives from all member countries and meets regularly. The Dispute Settlement Body is responsible for settling disputes between member countries over trade matters.
The WTO also has a number of specialized committees and working groups. These committees and working groups deal with specific issues related to trade, such as agriculture, subsidies, and intellectual property rights.
The WTO is headquartered in Geneva, Switzerland. It has over 160 member countries.