If a company is having trouble with staffing levels because of employees calling in sick or requesting time off, what would be an approach to control daily staffing levels of a company so that the company is able to meet or exceed the customer's expectations for responsiveness? In this situation what would be an example of feedforward control, concurrent control, and feedback control? Also keeping in mind the following elements of paid vacation, unpaid vacation, dealing with peak times, and knowing whether customers are pleased with the service.