How to choose random spawn and spawn?

Im currently working on a game and unity and I do not have very much experience with Unity. I want to make a sphere game object spawn at one of four empty game object children. It should spawn after a trigger is triggered and it should choose randomly which empty game object children to spawn at. Does anyone have an idea of how to code this?

  1. create references to the four game objects

  2. on trigger, generate a random number 0-3

  3. set the sphere’s location to the location of the game object that corresponds with the random number you generated.