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Which of the following is the MOST effective accuracy control for entry of a valid numeric part number?
Correct Answer: D
A self-checking digit is the most effective accuracy control for entry of a valid numeric part number. This method involves adding an extra digit at the end of every number which is calculated from the other digits. This digit is then used to check the accuracy of the entered number1. While hash totals, online review of description, and comparison to historical order pattern can be used as accuracy controls, they are not as effective as a self-checking digit.