A is corrent because optical character recognition (OCR) software converts images of paper documents as read by a scanning device into text document computer files.
B is incorrect 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.
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.
D is incorrect because with a field (format) check the computer checks the characteristics of the character content, length, or sign of the individual data fields.
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