A broker is door-knocking in a neighborhood soliciting listing opportunities. The broker arrives at a property and finds another broker's sign on the property. What should the broker do?

A. the broker should make her presentation and have the owner sign a termination agreement for the current listing, and then have a new listing agreement signed

B. Not attempt to contact the property owner to solicit another broker's listing

C. if no one answer the door, leave a marketing brochure and her business card

D. the broker should go ahead and solicit the listing.