Which of the following is a true statement regarding data flows?
A. A data flow to a data store means retrieve or use.
B. A data flow from a data store means update.
C. A data flow may have double-ended arrows.
D. A data flow represents data at rest.
E. A join in a data flow means that exactly the same data come from any of two or more different processes, data stores, or sources/sinks to a common location.
Answer E