A monopolistically competitive firm is currently producing 20 units of output. At this level of output the firm is charging the highest price it can at $20, hos marginal revenue equal to $12, has marginal cost equal to $12, and has average total cost equal to $10. From this information we can infer that Oa. the profits of the firm are negative. Ob, firms are likely to leave this market in the long run. Oc. the firm is currently maximizing its profit. Od. the firm is earning zero profit