Question 1: (i) Which answer is an example of a check digit calculated by a simple summation?

A) 192 B) 886 C) 2467 D) 013 (ii) A customer filled in the wrong account number on the remittance advice being returned with payment. Consequently, the payment was credited to another customer's account.

A) Hash totals B) Field Check C) Closed- Loop Verification D) Reasonableness test. (iii) 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.

A) Referential integrity B) Entity integrity C) Completeness check D) Check digit