Use the following information for the next 6 line balancing questions. Task A Time (sec) Predecessor 80 None 20 A B C 40 None D 10 E 60 B 70 B F G 30 E, F, D H 90 G If the required cycle time is 129 sec/unit, what is the theoretical minimum number of workstations? O 2 4 O 3 O 1 6