which of the following is an acronym?

An acronym is a word formed from the first letters of a group of words and pronounced as a word itself, like NASA (National Aeronautics and Space Administration) or ASAP (As Soon As Possible). In many tests or quizzes, the correct choice will be the option where each letter stands for a word in a longer phrase (for example, “RADAR – Radio Detection and Ranging” is an acronym, while a plain word like “teacher” is not).