Which of the following statements is correct? (a) The NPV profile graph for a normal project will generally have a postive(upward) slope as the life of the project increase. (b) An NPV profile graph is designed to give decision makers an idea about how a project's risk varies with its life (c) An NPV profile graph is designed to give decision makers an idea about how a project's contribution to the firms value varies with the cost of capital (d) We cannot draw a project's NPV profile unless we know the appropriate WACC for use in evaluating the project's NPV (e) An NPV profile graph shows how a projects payback varies as the cost of capital changes