单选题 The data entry staff of the midwest plant of National Manufacturing Inc. has responsibility for converting all of the plant’s shipping information to computerized records. The information flow begins when the shipping department sends a copy of a shipping order to the data entry staff. A data entry operator scans the shipping order information onto a floppy disk. The disk is then used by verification clerks, who check the computerized record with the original shipping orders. When a given batch of files has been reviewed and corrected, as necessary, the information is uploaded to the company’s mainframe system at the home office. The most effective way to visualize and understand this set of activities would be through the use of a