It is unlawful for a dealer to do any of the following:
(a) Enter into a listing agreement that does not include a specified date upon which the agreement is to terminate.
(b) Claim or take any secret or undisclosed amount of compensation, commission, fee, or profit prior to, or at the time that a contractual agreement is signed whereby all parties involved, after negotiation, have come to terms. However, this section shall not be construed to require the disclosure of any exclusive financial arrangements agreed upon between the dealer and any financial institution with regard to financial arrangements applicable solely to them.
(c) Exercise any provision which allows the dealer an option to purchase the manufactured home, mobilehome, or commercial coach that is the subject of an agreement whereby a consumer authorizes or employs the dealer to arrange for its sale, purchase, or exchange, unless the dealer has, prior to exercising the option, revealed in writing to the consumer the full amount of the dealer’s profit in exercising the option and obtained the written consent of the consumer approving the amount of the profit.
(d) Fail to disclose any liens or encumbrances of which the dealer had knowledge on a manufactured home, mobilehome, or commercial coach.