For a major university, match each cost in the following table with the appropriate activity base. Each activity base may only be used once. Cost 1. Admissions mailing 2. Financial aid 3. Graduate teaching assistants 4. Housing 5. Identification cards Activity Base a. Number of enrollment applications b. Number of financial aid applications c. Number of students and faculty d. Number of enrolled students and alumni e. Number of students living on campus f. Student credit hours 6. Student records