A statistical study has been made to measure the quality of response (time in minutes) of a call center, obtaining as a result: mean= 8 min, variance = 1.44 min² and a proportion of queries resolved of 84%, this study was made with a sample of 35 calls, according to these data and considering a certainty of 95%, determine which of the following statements are true: I. The confidence interval for the population mean is [7.588; 8.412]. II. The confidence interval for the population variance is: [1.34; 1.42]. III. The confidence interval for the population proportion is: [0.80, 0.91].

Select one: a. I only. b. I and II. c. I and III. d. I, II and III. e. II and III.