Which button layout is the best?

I'm currently working on a modal in app, that can be display in full screen. I'm having some issue about the way to close this modal.

In the first situation, we can have a “Fermer” (close) button as main button where we can have a custom button if it’s set in the backo. Second situation is only a small “Fermer” at the top right corner like on the onboarding. The third situation is a combinaison of both with small button + “Fermer” main button. And finally, to not have a repetition of “Fermer”, we can put a small button + a different main button “Continuer” (continue). But wouldn’t it confuse the user who might think that it will continue on the content of the modal?

Tell me which option seems the best! Thanks!