Question: 2. Consider two four-bit 2's complement numbers, A and B. Using a 4-bit adder, and a multiplexer, and whatever else you need, design a circuit

2. Consider two four-bit 2's complement numbers, A and B. Using a 4-bit adder, and a multiplexer, and whatever else you need, design a circuit that computes A+B if input X is 0, and A-B if X is 1. HINTS: You do not need to show a truth table for this circuit. You do not need to show the gates inside the adder or multiplexer. We are designing at the block level here, where you use the adder and multiplexer as a component in the circuit. You may use additional gates if needed

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