Which of the following statements is correct? assume that all projects being considered have normal cash flows and are equally risky. a. if a project's irr is equal to its cost of capital, then under all reasonable conditions, the project's irr must be negative. b. if a project's irr is equal to its cost of capital, then under all reasonable conditions the project's npv must be zero. c. there is no necessary relationship between a project's irr, its cost of capital, and its npv. d. when evaluating mutually exclusive projects, those projects with relatively long lives will tend to have relatively high npvs when the cost of capital is relatively high. e. if a project's irr is equal to its cost of capital, then, under all reasonable conditions, the project's npv must be negative.