Which of the following statements are true? + Wahlen Sie eine oder mehrere Antworten: a. Contribution margin and relativ contribution margin do never difter b. The optimal production program of a company should be calculated by relative contribution margins Oc Contribution margin ist defined as revenue minus fixed costs Od. The optimal production program of a company should be calculated by contribution margins O e Contribution margin is defined as revenue minus variable costs 01. Contribution margin per unit is defined as unit price minus variable unit costs Og The optimal production program of a company calculated either by contribution margins or by relative contribution marginis do not differ, unless there is a production bottleneck Oh. Contribution margin per unit is defined as revenue minus variable unit costs