System Analysis and Design
The approach used in top-down analysis and design is

all of the listed here
to identify the top level functions by combining many smaller components into a single entity
to identify a top level function an d then create a hierarchy of lower-level modules and components.
to prepare flow charts after programming has been completed

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System Analysis and Design
In Decision trees

None of these
the root is drawn on the left and is the starting point on the decision sequence.
the branch depends on the condition and decisions to made
All of these
nodes represent the conditions, with the right side of tree listing the actions to be taken

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