5 pts Whippet Shoe Company has three product lines: Running Shoes, Hiking Shoes and Walking Shoes. The CEO of Whippet wants to quantity the financial effects of discontinuing the Walking Shoes product line. The best metric for the CEO to use to determine the effect of discontinuing the Walking Shoes product line on the company's future operating income would be the product line's: O Segment margin. O Segment margin minus an allocated portion of common fixed costs. O Contribution margin. Contribution margin minus an allocated portion of common fixed costs. O Gross profit minus traceable fixed costs.