6- (Solve questions 6-7 based on the information given in this question.) The assembly activities of a new product must follow the precedence relations given in the following table. Task times are in minutes. The company expect to have a monthly demand of 480 units for this new product. Assume that there are 5 working days per week, 4 weeks per month, 2 shifts per day, and 360 minutes per shift working time. a) What is the theoretical minimum number of work stations? (5 pts) Task Task time Immediate Predecessor A 5 B 23 --- C 9 A D 30 A E 18 B F 12 D, E G 6 E H 16 1 4 F, H J 20 F, G K 11 I, J a) O 60 min b) O 11 min c) O 15 min d) 0.5 min e) O 30 min O Bo brak