All of the following are prevention methods for overstated expense reimbursements, EXCEPT: a. Run expense reimbursements per employee looking for individuals whose travel and entertainment expenses appear to be out of line. b. Only reimburse air travel expenses from itineraries supplied by travel agencies c. Do not reimburse any expenses supported by a photocopied receipt without first verifying that the expense is legitimate. d. Spot-check expense reports with vendors.