System Analysis and Design
A couple:

None of these
None of these
is a data item that moves from one module to another
is represented by a line joining two modules
means that the upper module has the capability of calling the lower module

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System Analysis and Design
In a Decision tree

the root is drawn on the left and is the starting point on the decision sequence
all of the listed here
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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