Consider the statements that follow. 1. Variable selling costs are expensed when incurred. 2. The income statement discloses a company's contribution margin. 3. Fixed manufacturing overhead is attached to each unit produced. 4. Direct labor becomes part of a unit's cost. 5. Sales revenue minus cost of goods sold equals contribution margin. 6. Fixed selling and administrative expenses are treated in the same manner as fixed manufacturing overhead. 7. This method must be used for external financial reporting. 8. This method is sometimes called full costing. 9. This method requires the calculation of a fixed manufacturing cost per unit. Required: Determine which of the nine statements: A. Relate only to absorption costing. B. Relate only to variable costing. C. Relate to both absorption costing and variable costing. D. Relate to neither absorption costing nor variable costing. Your answer should be in the following format (statement numbers are for example only): A. 1, 2, 3 B. 4, 5, 6 C. 7,8 D. 9