White Leo Autos manufactures and markets four different cars: Leo Sport, Leo Prestige, Leo Spark, and Leo Ease. These four product variants are operated as individual business units. While the product leaders of Leo Sport, Leo Prestige, and Leo Spark have adopted a differentiation strategy to attract the niche market: the product leader of Leo Ease follows a cost$-$leadership strategy to suit the mass market. This decision of the product leader of Leo Ease can be ideally categorized as a $\_\_\_\_\_$ strategy.