Question: A computer operator accidentally used the wrong master file when updating a transaction file. As a result, the master file data is now unreadable. Which

A computer operator accidentally used the wrong master file when updating a transaction file. As a result, the master file data is now unreadable. Which control could best have prevented this from happening?

Header reflard.

Validity check.

Trailer record.

Parity check.

A computer operator accidentally used the wrong

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