Which of the following errors probably would be corrected by key verification of data input?
a. A salesperson manually enters an incorrect product number on a sales invoice, which is subsequently given to a data entry operator in the information systems department for key transcription to machine-readable format.
b. A data entry operator in the information systems department mistypes a product number on a sales invoice while keying the document to machine-readable format.
c. both a and b
d. neither a nor b
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