An appraiser would NOT be in violation of the USPAP if he:

a. pays people to refer clients to him.
b. accepts an appraisal assignment, knowing that he is not fully qualified to handle the assignment.
c accepts an appraisal fee based upon a percentage of the value estimate.
d. accepts an appraisal fee for service on a property in which he has an interest, a fact which has been disclosed to his client in writing.