Which of the following is untrue about processing controls?

a.

If an invoice does not match with the information on the purchase order, this indicates that there is a failure in internal control.

b.

Two important types of internal labels are header and trailer records.

c.

RFID tags are write-protected so that unscrupulous customers cannot change the price of merchandise.

d.

Concurrent update control is one that locks out another user until the system has finished processing the transaction entered by the other user.