Answer:
The issue is whether Joe is liable to pay for Bob to Avarice Bank or not.
Joe should prevail.
Explanation:
The original contract is between bank and Bob and in that contract Joe is not involved. Secondly payment on someone' behalf always has to be a written contract.
According to UCC, suretyships have to be written for them to be enforceable. This is mentioned in Statute of Frauds. It clearly states that any gurantee by thrid party for payment of debts has to be in writing.