Which of the following statements correctly explain the purpose of an investment policy statement? A) Possible investment strategies that should be pursued by an investment advisor on behalf of the client begin with the formulation of a complete and thorough investment policy statement. B) All of these. C) The investment policy statement can be used as the basis to measure the manager's performance against the stated objectives and constraints. D) An investment policy statement is a written document that establishes client objectives and lists limitations on the investment manager