You are researching portable GPS systems for use in your company’s existing fleet of 35 delivery vans. You are considering such factors as ease of use, size of screen, number of points of interest, and Bluetooth compatibility. You conclude that the three leading models are quite similar in all but one way: price. One model costs about 30 percent less than the other two models. In organizing your discussion of the three models, should you use the whole-by-whole pattern or the part-by-part pattern? Why?