Answer (C) is correct . All of the terms listed refer to program controls to prescreen or edit data prior to processing, but the sequence check is most likely to be used only in batch processing. A sequence check tests to determine that records are in proper order. For example, a payroll input file would be sorted into Social Security number order. A sequence check could then be performed to verify record order. This control would not apply in a real-time operation because records would not be processed sequentially.
Answer (A) is incorrect because Sign checks test data for the appropriate arithmetic sign. For instance, hours worked in a payroll should always be a positive number.
Answer (B) is incorrect because Reasonableness tests verify that the amounts of input or output fall within predetermined limits.
Answer (D) is incorrect because A redundancy check requires transmission of additional data items to check a previously received data item; for example, a few letters of a customer’s name could be matched against the name associated with the customer number.
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