The correct answer is (2).
The Nuremberg Trials took place after World War II. The goal of these trials were to punish Nazi officers, politicians, and members of the military for their actions during World War II. This court was the first of its kind, as it set the groundwork for the United Nations Genocide Convention and the Universal Declaration of Human Rights.
Ultimately, this trial showed that any actions taken during a time of war may be used against you in an international court.