20-4-1 Obligation extinguished by full performance. 20-4-2 Joint obligation extinguished by performance by one person. 20-4-3 Joint right extinguished by performance to one person--Deposit excepted. 20-4-4 Obligation extinguished by performance in manner directed by creditor. 20-4-5 Indivisible obligation partially extinguished by partial performance if benefit voluntarily retained--Exception. 20-4-6 Performance applicable to two or more obligations. 20-4-7 Performance applied according to debtor's intent. 20-4-8 Application of performance according to creditor's selection--Application to rights held individually and as trustee--Rescission of application made by creditor. 20-4-9 Application of performance in absence of selection by parties.