A company is developing a linear programming model for a hybrid aggregate plan that combines pure chase demand with level production strategies. The company's workforce constraint for period 2 is A. number of workers in period 1 - number of worker fired in period 1 + number of workers hired in period 2 = number of workers in period 2 B. beginning workforce + number of workers hired in period 2 - number of workers fired in period 2 = number of workers in period 2 C. number of workers hired in period 1 - number of workers fired in period 2 = number of workers in period 2 D. number of workers in period 1 + number of workers hired in period 2 - number of workers fired in period 2 = number of workers in period 2