Which of the following statements concerning respirator fit testing is true? A) If a worker has had a quantitative fit test, qualitative fit testing is not needed as long as he or she continues to wear the same respirator. B) Quantitative fit testing is less reliable than qualitative fit testing because it requires the use of special respirators equipped with sampling probes, rather than the actual respirator to be worn by the worker. C) Quantitative and qualitative fit testing both require expensive, sophisticated equipment if they are to be performed properly. D) The NIOSH-recommended approach to fit testing is to use quantitative fit testing during the respirator selection process, followed by periodic qualitative fit testing during actual respirator use. Choose one option above and explain briefly why the other 3 options are false