(1) If the obligor owes performance of the same kind to the obligee under more than one obligation, and if what the obligor pays does not suffice to redeem all debts, that debt is redeemed that the obligor determines when they perform.
(2) If the obligor does not make a determination, then the first debt redeemed is the debt due for redemption; among more than one due debt, the one offering the obligee the least security; among more than one equally secure debts, the more onerous one; among more than one equally onerous debts, the oldest debt; and where all are equally old, each debt proportionally.