(a) Compliance by a trustee or other fiduciary with W.S. 9-3-438 through 9-3-440 shall be determined in light of the facts and circumstances existing at the time of the trustee or fiduciary's decision or action and not by hindsight.
(b) A trustee's investment and management decisions shall be evaluated not in isolation but in the context of the trust portfolio as a whole and as a part of an overall investment strategy having risk and return objectives reasonably suited to the program or appropriate grouping of programs.