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Please read the brief synopses from the Wall Street Journal and answer to the multiple-choice question(s). Nassauer, Sarah. (August 29, 2019). 'Lower-Income Shoppers Fuel Gains at Dollar Chains' Dollar General and Dollar Tree separately said sales rose during the most recent quarter. Both chains find their core lowand middle-income shoppers continue to spend amid low unemployment and rising wages. Overall, both chains, which are focused on value and often sell smaller amounts of products at lower dollar amounts than big-box competitors, have fared well as shoppers search out value and convenience even as more shopping shifts online. In general, retail chains are having a hard time. However, Dollar General and Dollar Tree are seeing their sales rise. Which generic business level strategy is leading to their competitive advantage? Internationalization Overall cost leadership Differentiation Focus cost leadership