Question: The following four schematics try to implement a full adder using half adders. Which one is correct? umo sumi sum half addero couto half addera

The following four schematics try to implement a full adder using half adders. Which one is correct? umo sumi sum half addero couto half addera couti OR cout sumo sumi sum half addero couto half addera couti xnor cout umo sumi sum half addero couto half addera couti AND cout umo sumi sum half addero couto half adderi couti NO cout
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