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The courier service company would like to prepare the delivery service schedule for their staff. Every staff is estimated to deliver on average 40 units parcels to their customers. The company working policy for the staff is to work for five consecutive days and off for two consecutive days per week. The company has estimated the number of parcels to be sent to the customer from Monday to Sunday are as below: a) What is the minimum number of staff required weekly (from Monday to Sunday)? b) Use the work-shift-heuristic procedure to develop a weekly work-shift schedule for the staff. c) How many staff work shifts of slack per week are present in your proposed schedule? How could this slack be avoided? Is your schedule optimal