System Analysis and Design
A data flow diagram is

the primary output of the systems design phase
All of these
None of these
mainly used at the systems specification stage.
the modern version of flowchart

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System Analysis and Design
In a Decision tree

all of the listed here
the root is drawn on the left and is the starting point on the decision sequence
the branch, to be followed, depends on the conditions and decisions, to be made
the nodes represent the conditions, with the right wise of tree listing the actions to be taken

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