A single-plant firm trying to select the rate of output consistent with an overall plant size that yields the minimum efficient scale will choose a rate output for which

a) The long-run marginal cost curve crosses the long-run average fixed cost curve at the rate of output.

b) Long-run average total cost is lowest at the rate of output.

c) The short-run marginal cost curve crosses the short-run average total cost curve at that rate of output.

d) Total fixed cost are minimized at that rate of output.