Marginal Cost is O the per unit fixed cost of production. 0 the per unit variable cost of production. O the addition to cost associated with one additional unit of output. 0 the per unit cost of production. Average Total Cost is O the addition to cost associated with one additional unit of output. 0 the per unit variable cost of production. O the per unit fixed cost of production. O the per unit cost of production. Average Variable Cost is O the addition to cost associated with one additional unit of output. 0 the per unit variable cost of production. 0 the per unit fixed cost of production. 0 the per unit cost of production. Which of the following is true? 0 The average total cost curve is U-shaped. O The average variable cost curve is U-shaped. 0 Neither option is correct 0 Both options are correct