The correct answer is: A. 1, 2 and 3
The International Atomic Energy Agency (IAEA) is an intergovernmental organization that promotes the peaceful use of nuclear energy and safeguards against its use for military purposes. It was established as the world’s Atoms for Peace organization in 1957. The IAEA Secretariat is headquartered at the Vienna International Centre in Vienna, Austria. In terms of its Statute, the IAEA reports annually to the UN General Assembly.
Statement 1 is correct. The IAEA was set up as the world’s Atoms for Peace organization in 1957.
Statement 2 is correct. The IAEA Secretariat is headquartered at the Vienna International Centre in Vienna, Austria.
Statement 3 is correct. In terms of its Statute, the IAEA reports annually to the UN General Assembly.
Therefore, all three statements are correct.