1 Which of the following data flow diagram symbols is correctly identified? b. d. External entity b) Internal entity c Communication link (e.g., a satellite connection) d) Data store (file) 2. The document flowchart symbol for a manual file (such as a file cabinet of accounts receivable invoices) is: a) b) c) d) 3. This is the document flowcharting symbol for a source document such as a purchase order a) b) c) 4.This is the document flowcharting symbol used to represent an online file: c) d)