WD$-40$ is a multi$-$use water$-$displacement product, used for cleaning and lubricating in a range of applications from household, to automotive, industrial, and more. The company uses a single marketing mix for WD$-40,$ with little, if any, alterations. Which targeting approach is being used for WD$-40?$

A$)$ Focused$/$Concentrated

B$)$ Differentiated

C$)$ Undifferentiated

D$)$ Positioning