Oliva runs an advertising agency and is trying to decide whether to assign Benjamin (a man) or Mia (a woman) to a new advertising account for a national makeup line. Oliva believes that they both are strong candidates, so she decides to present the two of them to the client for a final decision. The client says that because this work relates to makeup, he would prefer working with Mia instead of Benjamin because she is a woman, and it is therefore more likely that she would have used the products. Based on this conversation, Oliva assigns Mia to the account. Is Oliva's conduct in this matter legal or illegal? Please discuss, using applicable legal authority.