First time ever clicked on the link for an awareness question. I read the question and my instant thought was that doesn't look right how is the case going to work.
Next thought, well maybe I am not "aware" let's try it.
Next thought, ah Mr White was trying to catch me up, and I chose 1,2,3.
Next thought after a big red X you are wrong came up, ah attention to detail is still as important as it has always been.
Next thought is programming of the answer wrong? or the syntax in the question?
From my test I saw the edge case of the null for value 3
Thanks for the awareness.