Add one class? It says we need 3. Totally confused here

https://www.freecodecamp.org/challenges/target-the-same-element-with-multiple-jquery-selectors

It says here:
Only add one class with each of your three selectors.

What the hell does that mean?

What’s wrong with my code and whats wrong with my code?

You’re going to use three different selectors that add one class each. So the .button selector adds one class, the .btn selector adds another, etc., until you have three in total.