Final answer:
Standard practice is to write out the full organization names followed by abbreviations, which can be used thereafter. Examples include NATO, NASA, and UNESCO, with AIDS being a health condition, not an organization.
Step-by-step explanation:
When referencing organizations for the first time, it is standard to write out their full names followed by their abbreviations in parentheses. After this initial mention, the abbreviation can be used exclusively throughout the document.
An example of this would be the North Atlantic Treaty Organization (NATO), which is an international defense alliance. Another organization is the National Aeronautics and Space Administration (NASA), a United States government agency responsible for the nation's civilian space program and for aeronautics and aerospace research.
Similarly, the United Nations Educational, Scientific and Cultural Organization (UNESCO) works to preserve cultural and historical heritage sites around the world.
Unlike these organizations, Acquired Immune Deficiency Syndrome (AIDS) is not an organization but a health condition caused by the human immunodeficiency virus (HIV).