a) Establish 3 upper and lower control limits. UCLp= (enter your response as a fraction between 0 and 1, rounded to three decimal places). LCLp= (enter your response as a fraction between 0 and 1, rounded to three decimal places). b) Why can the lower control limit not be a negative number? A. Since the upper control limit is positive. B. Since the upper control limit cannot be a negative number. C. Since the percent of defective records is always a positive number. D. Since the percent of defective records cannot be a negative number