Answer (C) is correct . A check digit, or self-checking number, is an input control to determine if an error might have been made on an identification number. The digit is an extra number on the end of the identification number (creating a new ID number) that is calculated by an algorithm on the original part of the ID number. If the ID is miskeyed, the algorithm will produce a number different from the check digit and an error will be detected and reported.
Answer (A) is incorrect because A batch total is the total of an information field in a batch of records.
Answer (B) is incorrect because A?record count is a control total using a count of records processed during the various phases of the operation of a program.
Answer (D) is incorrect because A checkpoint is a point in a program at which data are recorded for backup purposes.
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