The owners of a house sign a listing agreement and later tell the salesperson that the garage roof leaks. If they tell the salesperson not to reveal the roof's condition to any prospective buyers, the salesperson MUST:
A) Abide by the owners' request
B) Advise the sellers that they must disclose the condition of the roof to prospective buyers
C) Advise only those prospective buyers who ask about the roof's condition
D) Refer all prospective buyers who have questions about the roof's condition to the sellers