Answer "True" or "False" to the following statements. If False, please correct it. [8 pts] a) If the understocking and overstocking costs per unit in the newsvendor problem both double, then the optimal quantity will not change. [2 pts] b) All else equal, a larger understocking cost per unit leads to a larger optimal newsvendor order quantity. [2 pts] c) When the demand variability increases, the optimal newsvendor order quantity must increase as well. [2 pts] d) If the shadow price is positive, then the left hand side must be equal to the right hand side at the corresponding constraint. [ 2pts]