Which one of the following is not related to United Nations ?

1. The United Nations system includes its principal organs, specialized agencies, funds and programmes, and related organizations. 2. The World Bank Group is a specialized agency of the United Nations. The World Bank Group comprises five institutions: IBRD, IDA, International Finance Corporation (IFC), Multilateral Investment Guarantee Agency (MIGA), and International Centre for Settlement of Investment Disputes (ICSID). 3. Therefore, MIGA (A), IFC (B), and ICSID (C) are all part of the World Bank Group and thus related to the United Nations. 4. The Bank for International Settlements (BIS) (D), established in 1930, is an international organization of central banks based in Basel, Switzerland. It serves as a bank for central banks and fosters international monetary and financial cooperation. It operates independently and is not part of the United Nations system. 5. Hence, the Bank for International Settlements is not related to the United Nations.