System Analysis and Design
The black-box concept:

None of these
is invoked by describing a system in terms of inputs and outputs, leaving the transformation process a black box.
All of these
assumes that the black box is independent
assumes that inputs and outputs will remain stable

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System Analysis and Design
Reverse video is a technique of

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

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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 nodes represent the conditions, with the right wise of tree listing the actions to be taken
the branch, to be followed, depends on the conditions and decisions, to be made

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