A seller knows that the roof leaks, but so far no visible damage has occurred. The seller has a real estate broker who is a single agent for the seller, and the broker also knows about the leak. If potential buyer looks around the house and asks nothing about the roof, the broker's legal obligation regarding this matter is satisfied if she says

a. nothing about the roof's condition.

b. the roof appears to be in good condition.

c. that there is no sign of water damage.

d. that there is a leak now in the roof.