The International Bank for Reconstruction and Development (IBRD, a part of the World Bank Group), the International Finance Corporation (IFC, also part of the World Bank Group), the International Fund for Agricultural Development (IFAD), and the International Monetary Fund (IMF) are all specialized agencies of the United Nations (UN). They were all created by the members of the UN to focus on specific sectors or issues.

IBRD is focused on poverty reduction and sustainable development by providing loans and offering advice and training in both development-related disciplines and economic sectors.

IFC, part of the World Bank Group along with IBRD, offers investment, advisory, and asset management services to encourage private sector development in less developed countries.

IFAD focuses on alleviating rural poverty in developing countries by providing low-interest loans and grants to governments to carry out agriculture and rural development projects.

IMF oversees the global monetary system and provides monetary cooperation and financial stability by providing policy advice, working as a forum for intergovernmental negotiation, and providing financial assistance.

So, option 4, which includes all these organizations, is correct.