8.11 Which controls would best mitigate the following threats?
a. The time worked field in a payroll transaction record contained the value 400 instead of 40. As a result, the employee received a paycheck for $6,257.24 instead of $654.32.
b. The accounts receivable file was destroyed because it was accidentally used to update accounts payable.
c. During processing of customer payments, the digit 0 in a payment of $204 was mistakenly typed as the letter "O." As a result, the transaction was not processed correctly and the customer erroneously received a letter that the account was delinquent.
d. A salesperson mistakenly entered on online order for 50 laser printers instead of 50 laser printer toner cartridges.
e. A 20-minute power brownout caused a mission-critical database server to crash, shutting down operations temporarily.
f. A fire destroyed the data center, including all backup copies of the accounts receivable files.
g. After processing sales transactions, the inventory report showed a negative quantity on hand for several items.
h. A customer order for an important part did not include the customer's address. Consequently, the order was not shipped on time and the customer called to complain.
i. When entering a large credit sale, the clerk typed in the customer's account number as 45982 instead of 45892. That account number did not exist. The mistake was not caught until later in the week when the weekly billing process was run. Consequently, the customer was not billed for another week, delaying receipt of payment.
j. A visitor to the company's Web site entered 400 characters into the five-digit Zip code field, causing the server to crash.