In estimating the Weighted Average Cost of Capital (WACC), we assume that the firm's capital structure reflects: a Weighted discounted values. b Proxy values based on historical data. c Optimal (target) values. d Bookvalues. For mutually exclusive projects, the NPV and IRR criteria contradict each other: a When NPVis negative. b When the crossover rate is greater than the cost of capital. When the crossover rate is less than the cost of capital. d When the IRR is negative