8.11 Which control(s) 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.