Which of the following statements is right: O Other things held constant, the more debt a firm uses, the lower the firm's profit margin will be. O Other things held constant, the less debt a firm uses, the lower the firm's profit margin will be. O Other things held constant, the more debt a firm uses, the lower the firm's operating margin will be. O Other things held constant, the less debt a firm uses, the lower the firm's operating margin will be