We know that if the WaitForReady was "None" then once the button is loaded, the robot would click on it and it would keep going.
We also know if it was set to "Complete" the robot should wait till the whole page loads (which does not happen says the exercise), so the robot cannot click in this case, but it will continue.
But it is set to Interactive, which is a bit more confusing. The documentation only says:
"- Waits for the target app to indicate readiness, although some assets may still be loading."
I believe a browser will be ready just because an animation is not yet loaded (just like having facebook in your chrome, you can start scrolling down, while posts are still loading, to navigate to newer posts).
So in this case I chose, that the robot will be able to click once its fully loaded. D