System Analysis and Design
A couple:

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

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System Analysis and Design
Reverse video is a technique of

None of these
showing data upside down on the screen
emphasizing data by reversing the foreground and background
hiding confidential data on the screen
showing data with half brightness

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