Due to poor market conditions a seller sold his property for considerable less than the listed price. Could the seller lower the broker;s commission to make up for the loss?

A. Yes, since the commission rates are negotiable they can be changed at any time by the broker or seller.
B. Yes, the loss that the seller took would be shared by the broker a lower commission rate.
C. No, the rate of commission is set by the state's real estate commission and cannot be changed.
D. No, once the commission rate has been negotiated and agreed upon it cannot be changed unless bother parties agree.

Answer: D. No, once the commission rate has been negotiated and agreed upon it cannot be changed unless bother parties agree.