Answer: The third statement
Explanation: The techniques he employed to use is were a possible fault could occur. Because the principle office is not were every student of the school would go and not every 4th student that enters the office would represent the same thing of what other students are saying. I believe the technique used might be wrong. I would employ that he should consider going to the cafeteria and do some research on the policy and see at first hand the reaction of the students than the principle office.