An old puzzle

I found this in a mail that was sent to me long ago...Njoy.

Dr. Frank N Stein is teaching a course in fuzzy logic this semester. The
eminent AI guru is notorious for his difficult tests, so the students
have begged him repeatedly for a multiple choice quiz. Finally, with a
devious smile, he agrees. On the next test, he asks the first question
in Swahili, which no one can read. However, the following answer choices
are in English.

a)All of the below
b)None of the below
c)All of the above
d)One of the above
e)None of the above
f)None of the above

Select the correct answer...