Which of the Following Is Not an Accurately Stated Convention

Multiple Choice

Which of the following is not an accurately stated convention for data flow diagramming?

A) A process must have at least one input data flow and one output data flow.
B) A data flow has at least one end connected to a data store.
C) A data store must have at least one input data flow and one output data flow.
D) Any single DFD should not have more than about seven processes.
E) Data cannot move directly from one data store to another data store; data must be moved by a process.