I was wondering if there is a way to choose options using keyboard arrows. For example, when Finder asks me whether I want to open a downloaded file from the internet, and I want to say "No", I want to be able to press left and press enter and that'll be it. Instead, I have to use my mouse to click on No. Is there a way to do this? I went to System Prefs, Keyboards, and clicked on All Controls, but that wasn't the solution.