A company named "Efficient Manufacturing" operates an assembly line with four workstations. The tasks, their times, and precedence relationships are as follows: Task Time (minutes) Immediate Predecessors A B COE D E 10 20 15 25 10 - A A B, C D The company operates 8 hours per day and the market demand for the product is now only one unit per day. Questions: Provide calculations, logic and explanation. a. What is the required cycle time for the line? b. What is the theoretical minimum number of workstations? c. Propose a balanced line and compute its efficiency. d. What are the implications of a significant variation in the processing times of process A on the rest of the tasks?