The following six variables are part of a data set involving students. Which of these variables are quantitative? Choose only 1 answer. Variable a - Student Identification Number Variable b - Degree Program Variable c - Course Evaluation scale: poor, acceptable, good, excellent Variable d - Score on the first exam (based on 100 possible points) Variable e - Age of student None of the variables are quantitative. d and e c and e a and b All six are quantitative variables