Consider a Base$-$Stock model with random and normally$$distributed demand. If the marginal cost of excess is greater than the$$marginal cost of shortage, when demand variance increases

Group of answer choices

the optimal safety stock level increases

the optimal base$-$stock and the optimal safety stock levels both decrease

the optimal base$-$stock and the optimal safety stock levels both increase

the optimal safety stock level decreases

the optimal base$-$stock level increases

the optimal base$-$stock level decreases