The correct answer is Option 4: Neither 1 nor 2.

Reasoning:

1. The Nuclear Security Summits are not held under the aegis of the United Nations. The Nuclear Security Summits were a series of summits that were initiated by US President Barack Obama in 2010 to address the threat of nuclear terrorism. The summits were not held under the aegis of the United Nations but were instead organized by the host countries, with the support of the United States. The summits were held in Washington DC (2010), Seoul (2012), The Hague (2014), and Washington DC again (2016).

2. The International Panel on Fissile Materials (IPFM) is not an organ of the International Atomic Energy Agency (IAEA). The IPFM is an independent group of experts that was established in 2006 to provide technical and policy analysis on issues related to the production, stockpiling, and use of fissile materials. The IPFM is not affiliated with any government or international organization, including the IAEA.

Additional information:

The International Atomic Energy Agency (IAEA) is a specialized agency of the United Nations that was established in 1957 to promote the peaceful use of nuclear technology and to prevent the proliferation of nuclear weapons. The IAEA works with its member states to promote nuclear safety, security, and non-proliferation, and to provide technical assistance in the areas of nuclear energy, radiation therapy, and nuclear medicine. The IAEA is headquartered in Vienna, Austria, and has 173 member states as of 2021.