Answer:
All of the Above.
Step-by-step explanation:
Foreign Policy. It is the President's duty to make decisions on this, and it comes in a variety of ways. First off, He could make executive agreements, which is an international agreement, usually regarding routine administrative matters not warranting a formal treaty, made by the executive branch of the US government without ratification by the Senate. He is the Commander in Chief of the most powerful military in the world. He can order military intervention, or call in operations. He also appoints US Ambassadors, which basically make decisions and advise the President about other countries and there motives. So, your best answer would be the last one.