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. Spot-check expense reports with vendors.

c. Only reimburse air travel expenses from itineraries supplied by travel agencies

d. Do not reimburse any expenses supported by a photocopied receipt without first verifying that the expense is legitimate.