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

Add one class? It says we need 3. Totally confused here
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#1

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?


#2

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.