C is corrent because the use of a header label allows the computer operator to determine whether the correct file has been selected for processing. Therefore, header labels will most likely prevent errors by the computer operator who mounts the magnetic tapes on the tape drives.
A is incorrect because the maintenance technician will not run the magnetic tape. Thus, the use of header labels will not affect the maintenance technician’s errors.
B is incorrect because the keypunch operator does not load magnetic tapes and, therefore, is not affected by the use of header labels.
D is incorrect because the programmer will write the programs and will not run them in a good internal control structure.
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