Justin wants to buy a new smartphone. He did a lot of research over the Internet and identified four attributes that he would rate his smartphone options on. He considered low price, sensitivity to touch, low weight, and compatibility with apps, as the attributes. He used a ten-point scale to rate how he thought each of his options would perform or how likely was it that the phones had those attributes. Next, he used a -3 to +3 scale to rate how he felt about these attributes. Finally, he opted for one particular model based on the highest overall attitude score. Which model did Justin implement?单项选择题