What is permanent working capital? O A. the amount that a firm keeps invested in its short-term assets to support its continuing operations which are financed by long-term debt B. the difference between the actual level of investment in short-term assets and the amount that a firm must keep invested in its short-term assets to support its continuing operations OC. the amount that a firm keeps invested in its short-term assets to support its continuing operations which are financed by short-term debt OD. the amount that a firm must keep invested in its short-term assets to support its continuing operations