7. Which of the following describes the difference between marginal costs and average total costs? a. marginal costs only consider variable costs, whereas average costs do not consider variable costs. Ob. marginal costs represent the additional cost incurred while producing one more unit, whereas average costs represent per unit costs. Oc. average costs consider fixed costs, whereas marginal costs do not consider fixed costs. Od. marginal costs represent costs per unit, whereas average costs represent the additional cost incurred while producing one more unit