In order to comply with the safe harbor requirements of Section 404(c) of ERISA, the trustee of a 401(k) plan must:I offer plan participants at least 3 different investment alternatives. II ensure that plan participants are insulated from control over their portfolios. III allow plan participants to change their investment options no less frequently than quarterly. IV allow plan participants to purchase U. S. Treasury securities. A) II and III. B) II and IV. C) I and IV. D) I and III.