Indiana Code Title 29. Probate § 29-1-10-3

(a) Said person, if an individual, has taken and subscribed before the clerk or any other officer authorized to administer oaths, an oath or affirmation that he will faithfully discharge the duties of his trust according to law and has given such bond as may be required and the bond has been approved by the court.

(b) Some officer of the corporation, if the person is a corporation, has taken and subscribed before the clerk or any other officer authorized to administer oaths, an oath or affirmation that said bank or trust company will faithfully discharge the duties of its trust according to law, has filed an acceptance of the appointment, duly executed and acknowledged by one (1) of its officers and, if a bond is required to be filed by it, shall have filed such bond as may be required and the bond shall have been approved by the court.  The oath and, if a bank or trust company, also the acceptance shall be filed and recorded as a part of the proceedings of the estate.