Answer:
a. Source documents provide control and reliability in an accounting information system.
Explanation:
The source documents are the documents that support all types of business transaction. It can be in terms of bank statement, purchase order, sales order, supplier invoices, etc. It can also known as vouchers
With the help of the source documents the accounting system provides the reliable and controlling of transactions
This is the first step to verify the transactions after that recording, posting of transactions could be done.