Answer:
1. Check
5. Invoice from supplier
8. Bank statements
9. Purchase order
Step-by-step explanation:
Source documents are used to trace a transaction. The main characteristic of a source document is that it does not originate within the company but needs to be signed or authorized by both the company and a third party such as a bank, a customer, and a creditor or supplier. The above are the only source documents on the given list.