Dollar store chains such as Dollar General in their current form illustrate which of the following strategic choices? broad differentiation strategy since they offer multiple products to multiple customer segments but through streamlined operations focused differentiation strategy since they offer multiple products at different prices, but only to a narrow segment of the market broad low cost strategy since they offer mostly standard and efficient products common across different customer segments Focused low cost strategy since they sell very low priced products to the lower segments in the retail market The efficient frontier in the differentiation-efficiency trade-off curve refers to: The costs at which the company breaks even The best quality level for a given level of cost and vice versa The price at which customer will agree to purchase the product The lowest cost possible for any company to achieve