Suppose Whirlpool refrigerator, 36 inch wide door, comes only in two modelswhite and stainless steel. Both models are priced at $1200 and have exactly the same functionality. Based on a recently conducted study, Whirlpool deiced to launch a third model, black slate, with the exact same functionality and price ($1200) as the previous two models. Whirlpool launching a black slate model is an example of ..(select ONLY 1 option from below, and explain your answer, 2 points, 50-100 words) Vertical line extension Horizontal line extension Brand Extension Price Discrimination Informative marketing communication