(c) A real estate broker or salesperson and his affiliates may act for more than one party to a real estate transaction as designated agents only with informed written consent. With informed written consent in the form prescribed by the board, a real estate broker or salesman may appoint one or more licensees to act as a designated agent on behalf of a purchaser and may appoint one or more other licensees to act as a designated agent on behalf of a seller for a potential real estate transaction. With informed consent in the form prescribed by the board, a real estate broker or salesman may appoint one or more licensees to act as a designated agent on behalf of a seller and may appoint one or more other licensees to act as a designated agent on behalf of a purchaser for a potential real estate transaction. Appointment of a designated agent shall not be made unless the party has consented, at the commencement of the party's agency relationship with the real estate broker, that the party's designated agency relationship shall not extend to any other licensee affiliated with a broker and shall be limited to the licensees appointed to act as designated agent. Upon appointment of a designated agent, the responsibility to satisfy agency duties owed to a purchaser or seller shall be solely the responsibility of the designated agent. Substitution of designated agents shall not be made without consent. When a designated agent is appointed, information known or acquired by the designated agent shall not be imputed to the appointing broker or salesman or to other affiliated licensees. Notwithstanding the foregoing, a designated agent and an appointing broker or salesman shall each have an obligation to reveal known material defects in a listed property and shall comply with all other requirements of law. When a real estate broker or salesman has appointed designated agents for both a buyer and a seller, the broker or salesperson shall be presumed to be a dual agent, who does not exclusively represent either the buyer or seller. Appointment of a designated agent shall not limit the liability or responsibility of the appointing broker or salesperson for breach of duty by a designated agent.