Tools of Foreign policy, is no doubt the correct answer. In layman's terms, the president can use this authority to fulfill goals of one sort or another. The president of the USA is not only the Commander in Chief but he is also the Chief Diplomat and uses his power to achieve diplomatic gains or negotiate with foreign countries over issues that are problematic. There are, I believe, three phases to Tools of Foreign Policy.
1. Diplomacy- negotiations with other countries. Usually this happens in privacy and once a deal is made it goes public however they might withhold certain info. Example, the Iran deal. That happened behind closed doors. American people didn't know what was being negotiated and what was in the deal until afterwards. No one except the president fully knows what was agreed upon.
2. Foreign Aid- usually we see this in the forms of military or economic aid.
3. Military use- typically a stronger force is using military power to further weaken the opposing side and by doing that the stronger side can obtain what they want.
Hopefully this helped and good luck.
