Which statement is true regarding WACC and its components? a. For an all-equity firm, the cost of equity of the firm is greater than the WACC of the firm. b. The cost of debt of a firm is usually less than the cost of equity of the firm. c. The WACC may decrease if the firm uses less debt capital and more equity capital. d. The WACC should be used as the discount rate for all projects that the firm considers. An increase in net working capital represents: a. a cash outflow. b. a cash inflow. c. an increase in fixed assets. d. a decrease in fixed assets