Braun's Brakes manufactures three different product lines: Model X, Model Y, and Model Z. Considerable market demand exists 18 models. The following per unit data apply: Selling price Direct materials Model X Model Y Model Z TIT $25 $30 $35 3 3 3 6 6 12 Variable support costs ($2 per machine-hour) 2 4 4 1 15 Direct labor ($6 per hour) Fixed support costs If there is a machine breakdown, then which model is the most profitable to produce? A. Model Z B. Models Y and Z OC. Model Y D. Model X