Thank you, Ms. Grewal.
The way it actually would work is that a commission of inquiry could be established under one of four bodies. The secretary-general himself could, under his own auspices, appoint a commission of inquiry, but as we understand it, this has only happened when the state in question has been in agreement with the establishment of the commission of inquiry. The two examples of that were Timor-Leste, I believe, and Pakistan after the assassination of prime ministerial candidate Bhutto.
Another way in which a commission of inquiry could be established is, as you said, the Security Council, but I think I've already noted that there are some challenges with respect to the Security Council because of the possibility that one of the permanent members would veto.
A commission of inquiry can also be established under the Human Rights Council. That would be done by way of a resolution brought by a member state. Then it would likely be voted by the 47 members of the Human Rights Council. It's not the secretary-general who would choose the route by which a commission of inquiry would be established. It's really the member states that are bringing the initiative to one of those UN bodies.
The other way in which a commission of inquiry could possibly be established would be under the General Assembly itself, although we understand that this has rarely been used. It's mostly been under the Security Council or under the Human Rights Council, as you pointed out. Under the General Assembly, you still have the challenges with trying to obtain broad-based support. Again, under the General Assembly, it would be the same sort of mechanism as under the Security Council or the Human Rights Council, where a state would bring the initiative to the body in question.