A data entry input control in which the application software sums the first four digits of a customer number to calculate the value of the fifth digit and then compares the calculated number to the number typed in during data entry is an example of a
A) check digit verification.
B) validity check.
C) closed-loop verification.
D) duplicate data check.

Question

Quizplus · Accepted Answer

This is an example of check digit verification, where the fifth digit of a customer number is calculated based on the first four digits, and then compared to the number typed in during data entry. This is done to ensure the accuracy of the entered data. Validity check, closed-loop verification, and duplicate data check are all different types of data entry input controls, but do not specifically apply to this example.

A Data Entry Input Control in Which the Application Software