No salesperson shall be employed by more than one dealer, unless the dealers are owned by the same person. Each dealer shall post and maintain in a place conspicuous to the public a list of salespersons employed. Each salesperson, factory representative, and distributor representative shall carry his license when engaged in his business and shall display it on request. Each dealer shall notify the Board in writing not later than the tenth day following the month of the termination of any licensed salesperson’s employment. In lieu of written notification, the license of the terminated salesperson may be returned to the Board annotated “terminated” on the face of the license and signed and dated by the dealer-operator, owner, or officer.