Refer to the following figure, which contains drafts of a context and level-0 DFD for a university class registration system. Which of the potential violations of rules and guidelines on these diagrams is not correct?
- Assume D1 and D2 are the same data store. in the level-0 diagram, the data store, Class Roster, does not have the data flow, Scheduled Classes, flowing into it, rather this data flow connects processes 2 and 3, thus these DFDs are not balanced;
- D1 can be in the Context diagram. However, it should be the same name as the data store in Level-0 diagram.
- Process 1 appears to accomplish nothing because its inflow and outflow are identical; such processes are uninteresting and probably unnecessary;
- None of these
