12. Braun's Brakes manufactures three different product lines, Model X, Model Y, and Model Z. Considerable market demand exists for all models. The following per unit data apply: Model X Model Y Model 2 Selling price S50 S60 $70 Direct materials 6 6 6 Direct labor (S12 per hour) 12 12 24 Variable support costs (S4 per machine- hour) 4 8 8 Fixed support costs 10 10 10 If there is a machine breakdown, which model is the most profitable to produce? A) Model X B) Model Y C) Model Z D) Models Y and Z