Develop a top$-$level ALU module with appropriate input$/$output ports.

o Design separate modules for each of the four chosen operations, utilizing

a combination of structural and behavioral modeling approaches.

$$ Modules: Adder, Subtractor, AndGate, OrGate, and ALU $($toplevel module$).$

$$ The ALU design should be modular, comprising separate modules

for each functionality.

$$ Implement the modules using structure, dataflow, and behavioral

modeling as below:

$1.$ Utilize structural modeling for Adder, Subtractor, and logic

gates.

$2.$ Implement dataflow modeling for connecting the modules.

$3.$ Utilize behavioral modeling for the top$-$level ALU module