To obtain evidence that controls over access to computer programs are properly functioning, audit teams most likely would

A$.$

create checkpoints at periodic intervals after data processing to test for unauthorized use of the system

B$.$

examine the transaction log to discover whether any transactions were lost or entered twice due to a system malfunction

C$.$

enter invalid identification numbers or passwords to ascertain whether the system rejects them

D$.$

vouch a random sample of processed transactions to assure proper authorization