Question: When the Nederlander Organization "retargets" recipients of email pre-sale blasts (such as the one used for Evita) based on whether they clicked "buy tickets" and did not make the purchase, they are a. Using behavioral targeting to send follow-up messages b. Using behaviorscan to understand why they didn't purchase tickets c. Performing observation research on email marketing success and failure d. Demonstrating how virtual shopping can use personal selling techniques