Based on the behavior shown in the following table, which of the following is a variable cost? Units Produced a. Cost Per Unit of Materials b. Cost Per Unit of Labor c. Total Utilities Cost 2 3 4 5 500 500 500 500 500 333 250 200 4,500 4,500 4,500 4,500 Multiple Choice Cost Per Unit of Materials O Cost Per Unit of Labor O Total Utilities Cost O Both the cost per unit of materials and the total utilities cost are variable costs