Vivian's listing agreement with her seller expired, and now the seller has listed her home with a different brokerage firm. Soon after, however, a buyer working with Vivian decides he is interested in said property. Which of the following statements is true based on this information?
1) The buyer can still purchase the property through Vivian
2) The buyer can only purchase the property through the new brokerage firm
3) The buyer cannot purchase the property
4) The buyer can purchase the property through any brokerage firm