3. The following precedence network is used for assembling a product. You have been asked to achieve an hourly output of 20 units. All times in this network are in minutes. What is the actual number of workstations after balancing the line? (you need to do the line balancing for this question). Assign tasks to workstations on the basis of most following tasks (Rule 1). Use greatest positional weight (Rule 2) as a tiebreaker.

Select one:

a. 4

b. None of the provided options

c. 3

d. 2

e. 1

2.8 d 1.0 0.7 1.2 0.1 + 3.0 a b g h e f 0.8 2.0