A licensee showed a property listed with another firm to a buyer. The seller's listing expired, and the seller did not relist the property but is selling it for$-$sale$-$by$-$owner. The listing firm submitted the buyer's name to the seller as a protected buyer. The buyer wants to see the property again and contacts the licensee that showed the property to the buyer when it was listed. Should the licensee take the buyer to see the property or should the licensee refer the buyer to the former listing firm? If the buyer wants to write an offer on the property, does the licensee have to execute a buyer agency agreement with the buyer before writing the offer?