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21. Which of the following costs at a manufacturing company would be treated as a product cost under both absorption costing and variable costing? variable selling and administrative a b variable moh yes yes no d yes no yes no no A. Option A B. Option B C. Option C D. Option D 22, The principal difference between variable costing and absorption costing centers on: A. whether variable manufacturing costs should be included in product costs. B. whether fixed manufacturing costs should be included in product costs. C. whether fixed manufacturing costs and fixed selling and administrative costs should be included in product costs. D. whether selling and administrative costs should be included in product costs. - - 23. If a cost is a common cost of the segments on a segmented income statement, the cost should: A. be allocated to the segments on the basis of segment sales. B. not be allocated to the segments. C. excluded from the income statement D. treated as a product cost rather than as a period cost