Change background color of a button

General
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1

Hello, I’m preparing for CSA, and I have a question over change a background color of a button.

You want your application to have consistent styling across portals. You want the background color of all buttons in your application to be blue. You want the background color of the buttons to be easily updated in case corporate branding changes.
Which attribute do you modify to set the background color?

  1. The buttons format

  2. The background mixin

I think that is option 2 because if in my case i use a button in all sections with the same button format, to change this background color is changing a bckaground color in a mixin, sure this mixin is use inside of a button format.

Thank you, have a good day!