When performing a study for reference ranges on a new method: a. perform the same demanding study as the manufacturer b. validate the manufacturer's reference range with 20 "normal" specimens, and if 3 or more fall outside the stated reference range, accept it anyways c. validate the manufacturer's reference range with 20 "normal" specimens, and if no more than 2 fall outside the stated reference range, accept it d. perform this study first before the studies for precision, accuracy, and reportable range