System Analysis and Design
A couple:

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

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System Analysis and Design
In a Decision tree

all of the listed here
the nodes represent the conditions, with the right wise of tree listing the actions to be taken
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

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System Analysis and Design
A square symbols

is a data store-data at rest, or a temporary repository of data
identifies data flow
represents a process that transforms incoming data flow(s) into outgoing data flows
defines a source or destination of system data
None of these

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