(a) A trustee shall administer the trust solely in the interests of the beneficiaries.
(b) This Code section shall not preclude the following transactions, if fair to the beneficiaries:
(1) An agreement between a trustee and a beneficiary relating to the appointment or compensation of the trustee;
(2) Payment of reasonable compensation to the trustee; or
(3) Performing and receiving reasonable compensation for performing services of a managerial, executive, or business advisory nature for a corporation or other business enterprise, where the trust estate owns an interest in the corporation or other business enterprise.