Consider the following comments about absorption-costing and variable-costing income statements. Which statement or combination of statements is the most accurate? O Cost of goods sold on an absorption-costing income statement includes fixed costs O A variable-costing income statement discloses a firm's gross margin O A variable-costing income statement discloses a firm's gross margin, and the cost of goods sold on an absorption-costing income statement includes fixed costs Cost of goods sold on an absorption-costing income statement includes fixed costs, and the amount of variable selling and administrative cost is the same on absorption- and variable-costing income statements O A variable-costing income statement discloses a firm's gross margin, the cost of goods sold on an absorption-costing income statement includes fixed costs, and the amount of variable selling and administrative cost is the same on absorption- and variable-costing income statements