Choice "C" is correct. Transaction logs would include all transactions, including payments made to a vendor, that have been processed against the master files. Since any changes to vendor accounts would have to be applied by a transaction, the transaction logs would reflect incorrectly applied adjustments as well as the original correct transactions. The logs would also include the identification of the individual who authorized the transaction. Choice "a" is incorrect. Error reports normally indicate transactions that contained some kind of error. If the accounts payable clerk were careful and made no errors, nothing about the unauthorized transactions would show up on error reports. Choice "b" is incorrect. Errors are not always maintained on files and thus there are often no error files. Errors are meant to be corrected and then the correct transactions processed. If error reports are produced, they are often discarded once the errors have been corrected. Again, if the accounts payable clerk were careful, nothing about the unauthorized transactions would show up on any error files that were actually generated or maintained.Choice "d" is incorrect. The validated transaction file would contain all transactions that have been edited and checked for processing. Since all transactions in the file would be assumed to be valid, the file might not include the identity of the individual who authorized each transaction since that information would be store in the transaction log.