Suppose, as part of his honours thesis, Phuc needs to examine the relationship between class size (measured by the number of students) and student satisfaction score (measured on a 0-100 scale where higher scores indicate higher satisfaction level). The covariance is -0.99. Which of the following is true? Select one: a. Class size causes the average satisfaction level to decrease. b. There is a very strong negative relationship between satisfaction and class size since the covariance is close to -1. O c. Satisfaction and class size are uncorrelated. O d. There is negative relationship between satisfaction and class size