All of the following options are functions of international law:
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Rights of Refugees - International law provides protections and rights for refugees, including the 1951 Refugee Convention.
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World Trade - International trade law governs trade relations between countries and includes agreements such as the World Trade Organization (WTO) treaties.
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Outer Space - International law regulates activities in space, including the Outer Space Treaty, which addresses the use and exploration of outer space.
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Human Rights - International law encompasses treaties and conventions that protect human rights, such as the Universal Declaration of Human Rights and various human rights treaties.
Thus, all four options are applicable functions of international law.