In the case of an interest in a testamentary trust:
(1) a disclaimer must be delivered to the trustee then serving;
(2) if no trustee is then serving, a disclaimer must be delivered to the personal representative of the decedent's estate; or
(3) if no trustee or personal representative is then serving, a disclaimer must be filed in the official public records of any county in which the decedent:
(A) was domiciled on the date of the decedent's death; or
(B) owned real property.