Which of the following control activities would most likely assure that no fictitious billings have been posted to the sales journal? The accounts receivable master file is compared with the general ledger control account

Which of the following control activities would most likely assure that no fictitious billings have been posted to the sales journal?

The accounts receivable master file is compared with the general ledger control account.

Each shipment on credit is supported by a prenumbered sales order.

The software application compares each sales invoice with the supporting shipping documents and notes any discrepancies.

The software application compares prices on the sales invoices with prices on the master price list and notes any discrepancies.