(a) A trust account may be paid, on request, to any trustee.
(b) Unless a financial institution has received written notice that a beneficiary has a vested interest not dependent on the beneficiary's surviving the trustee, payment may be made to the personal representative or heirs of a deceased trustee if proof of death is presented to the financial institution showing that the deceased trustee was the survivor of each other person named on the account as a trustee or beneficiary.
(c) Payment may be made, on request, to a beneficiary if proof of death is presented to the financial institution showing that the beneficiary or beneficiaries survived all persons named as trustees.