All categories are options, none of which were, the. And (b) if the good is considered to create a useful, but not as good, "is all" candidate will not choose at all if they are confident that there is at least one option could not be.
Type Options All of the above, none of the above, paragraphs a and b are the building is considered to be useful, but if you create a bad example, "all of the above" the test is not an option at all if they are convinced that there is a choice of at least 1 or not.
Option types, certain of, no any right, a and B, if build a better considered as useful, but if create bad, such as "all are correct." the examinees will not choose if he was sure there are options for at least 1 not