Which of the following was the main organ of the defunct OAU?

The main organ of the defunct OAU (Organization of African Unity) was the Assembly of Heads of State and Government. This was the highest decision-making body of the organization, where leaders from all member states would meet to discuss and decide on matters of concern to the continent. The Assembly was responsible for setting the overall policy direction of the OAU and for making important decisions on issues such as peace and security, economic development, and regional integration. It was made up of the heads of state or government of all member states, and its decisions were binding on all members.