At the very least, they probably mix up the order of the answers. On that basis, you immediately multiply the variants by 4!. I wonder if it would be faster to

At the very least, they probably mix up the order of the answers. On that basis, you immediately multiply the variants by 4!. I wonder if it would be faster to do that comparison or not. And this ignores any potential background animations or other non-static entities on the screen there might be.