I am working on a survey through Enterprise survey to be sent to all students. I chose to send the survey to the students enrolled in the classes for this semester. I only want the student to get the email once and take the survey once. But, if the student is enrolled in 4 classes, they are getting the email for each class and once taken, they continue to get reminders because they didn't do the survey in the other three classes. Any suggestions? I only want active students this semester, not all students within the BB system.