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 demand constraint to ensure that demand is met in period 3 is A. inventory in period 2+ units produced in penod 3+ inventory in period 3= demand in period 3 B. imventory in period 3+ units produced in penod 3= demand in peniod 3 C. beginning inventory + units producod in period 3 - invontory in poriod 3= domand in penod 3 D. inventory in period 2 , units produced in penod 3 - demand in period 3= inventory in penod 3