Z Ltd manufactures three products, the selling price and cost details of which are given below: Product X Product Y Product Z Selling price per unit 75 95 95 Cost per unit: Direct materials (5/Kg) 10 5 15 Direct labour (variable) (8/hour) 16 24 20 Variable overhead 8 12 10 Fixed overhead 24 36 30 In a period when direct materials are restricted in supply, the most and the least profitable uses of direct materials are: Most profitable Least profitable i X Z ii Y Z iii Z Y iv Y X Select one: a. ii. YZ b. i. XZ c. iv. YX d. iii. ZY