Answer (C) is correct . Self-checking digits may be used to detect incorrect identification numbers. The digit is generated by applying an algorithm to the ID number. During the input process, the check digit is recomputed by applying the same algorithm to the code actually entered. If the check digit is merely a sum, transposition errors will not be detected because the sum will be unaffected.
Answer (A) is incorrect because Completeness errors will be detected. The sum will be different if such errors occur.
Answer (B) is incorrect because Transcription errors will be detected. The sum will be different if such errors occur.
Answer (D) is incorrect because Validity errors will be detected. The sum will be different if such errors occur.
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