In North Carolina, the need for a dual agency agreement in residential sales transactions typically arises when

 A. a former buyer client of a real estate firm desires to list real property for sale with the same firm.

 B. a firm's buyer client expresses an interest in purchasing a property previously listed and sold by the firm, but currently listed by another competing firm.

C. a firm's buyer client under either an oral or written buyer agency agreement becomes interested in a property listed with the firm.

D. a complex transaction requires the services of two or more real estate licensees in order to provide appropriate services and representation to the client.