When you are returning the product for service to the factory service center, contact the bison service department to receive a r. a. (repair authorization) number prior to shipping. any postage, insurance and shipping cost incurred in sending your product for service is your sole responsibility. which of the following would not be a good reason for the company requiring a r. a. number before returning the product? a. it can be used to track the package if it is lost. b. it can be used to prioritize all products returned for repair. c. it can be used to replace a missing serial number. d. it might reference a particular repair department or center.