Under order of the court, a personal representative of an estate may mortgage or pledge by deed of trust or otherwise as security for an indebtedness any property of the estate as necessary for:
(1) the payment of any ad valorem, income, gift, estate, inheritance, or transfer taxes on the transfer of an estate or due from a decedent or the estate, regardless of whether those taxes are assessed by a state, a political subdivision of a state, the federal government, or a foreign country;
(2) the payment of expenses of administration, including amounts necessary for operation of a business, farm, or ranch owned by the estate;
(3) the payment of claims allowed and approved, or established by suit, against the estate; or
(4) the renewal and extension of an existing lien.