D is corrent because with a validity check the computer compares input reference data to tables or master files to make sure that valid codes are being used. In this example, the computer compared the input with a table containing the employee numbers of all active employees.
A is incorrect because with a field (format) check a computer checks attributes such as character content, length, or sign of the individual data fields.
B is incorrect because OCR software converts images of paper documents as read by a scanning device into text document computer files.
C is incorrect because a check digit is an extra reference number that follows an identification number and bears a mathematical relationship to the other digits. This extra digit is input with the data.
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