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21. 

In Decision trees
A. nodes represent the conditions, with the right side of tree listing the actions to be taken
B. the root is drawn on the left and is the starting point on the decision sequence.
C. the branch depends on the condition and decisions to made
D. All of the above
E. None of the above
22. 

The Data flow diagram (DFD) shows;
A. the flow of data
B. the processes
C. the areas where they are stored.
D. All of the above
E. None of the above
23. 

In data-flow diagrams, an originator or receiver of the data is usually designated by
A. a circle
B. an arrow
C. a square box
D. a rectangle
24. 

A data flow diagram is
A. the modern version of flowchart
B. mainly used at the systems specification stage.
C. the primary output of the systems design phase
D. All of the above
E. None of the above
25. 

Environment in systems parlance refers to
A. a sub-system
B. the boundary
C. a part outside the boundaries
D. All of the above
E. None of the above