For each internal control elements below, state whether they are to prevent or detect controls.

Salaries paid to employees are not processed until a valid tax file number is matched to the employee master file.
The sales manager reviews daily shipments, total sales, and sales per units shipped.
Bank reconciliation are performed to identify transactions processed by the bank that not recorded in the general ledger.
The supervisor of the accounts receivable department reviews reports of credit balances in customer accounts to determine their causes.
Sales invoices are automatically priced using the information in the price master file.
The customer account on each sales order is checked by the computer to a table of valid account numbers before the sales transaction is processed.
The computer performs a daily comparison of quantities shipped to quantities billed and generates a report of differences.
The computer performs various logic tests on supplier account numbers and addresses any issues before processing aa purchase order.