Toby White (11/2/2009)
Even though A is empty string versus Null the answer is still obvious given that it is multiple choice. In other words it was obvious that the author had just made a mistake between empty/null since options A and C were so far off.
Always assume that there is a right answer, and if none of the above is not shown, try and figure out which answer would be right assuming the author made a mistake.
Don't like this logic at all. It may result in your passing the test, but it requires you to try and figure out what the author "meant" the answers to be.
I used logic that went like this... if you know two of the answers are wrong, go with the one that might be right (i.e. error). Of course my "logic" failed and yours succeeded, this time. :-D