Which of the following is TRUE if a broker is acting as an agent of the seller?

a$)$ The broker may disclose personal information to a buyer if it increases the likelihood of a sale.

b$)$ The broker may agree to a change in the selling price without the seller's approval.

c$)$ The broker may accept a commission from the buyer without the seller's approval.

d$)$ The broker is obligated to tell the seller that the buyer is considering making a higher offer to purchase the property.