Quality Ceramic, Inc. $($QCI$)$ defined five submarkets within its broad product$-$market. To obtain some economies of scale, QCI decided NOT to offer each of the submarkets a different marketing mix. Instead, it selected two submarkets whose needs are fairly similar, and is counting on promotion and minor product differences to make its one basic marketing mix appeal to both submarkets. QCI is using which approach?

$QCl$ is actually using all of these approaches.

mass marketing approach.

combined target market approach.

multiple target market approach.

single target market approach.