Which of the Following Statements About Systems Flowcharts and Data

Which of the following statements about systems flowcharts and data flow diagrams is most true?

A) Lines are used in both, but they represent different things.
B) Circles are used in both, but they represent different things.
C) Both lines are used in both, but they represent different things and circles are used in both, but they represent different things are true.
D) Neither lines are used in both, but they represent different things nor circles are used in both, but they represent different things is true.