D Question 10 2 pts The three most common cost behavior classifications are: O variable costs, product costs, and sunk costs O fixed costs, variable costs, and mixed costs O variable costs, period costs, and differential costs O variable costs, sunk costs, and opportunity costs D Question 11 2 pts Which of the following costs is a mixed cost? O Salary of a factory supervisor O Electricity costs of $3 per kilowatt-hour O Rental costs of $10,000 per month plus $.30 per machine hour of use O Straight-line depreciation on factory equipment DQuestion 12 2 pts The graph of a variable cost when plotted against its related activity base appears as a O circle O rectangle O straight line O curved line