A professor that teaches Management Science assigns the final grade based on three examinations, where the maximum score of each is 100%. To earn an Athe overall average on the three exams must be at least 89%. Suppose that you score 80% and 79% on exams 1 and 2, respectively. Using Goal Seek, what is the minimum score that you need to earn on exam 3 to get an A? If a valid answer is possible, choose your value. If a valid answer is not possible choose "impossible" O A. 108 OB. 89 O C. 98 OD. impossible