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Which of the following statements is CORRECT? O An NPV profile graph is designed to give decision makers an idea about how a project's contribution to the firm's value varies with the cost of capital. O An NPV profile graph is designed to give decision makers an idea about how a project's risk varies with its life. O An NPV profile graph shows how a project's payback varies as the cost of capital changes. O The NPV profile graph for a normal project will generally have a positive (upward) slope as the life of the project increases