How many statements below about operating leverage are correct? 1. Operating leverage measures the sensitivity of a firm's operating income to changes in the firm's level of sales. 2. Automated operations results to greater operating leverage for the firm than mechanical operations. 3. An operating leverage of 5 means that a firm's operating income will increase by PO.5 for every P1 increase in sales. 4. Operating leverage will decrease as the firm's margin of safety increases. 5. The higher the firm's operating leverage, the higher is its income potential but at the same time, the higher the risk of incurring loss