Question: Use one 4 bit full adder, and one 4 x 1 MUX to build a function block that implements the following ALU: F = A

Use one 4 bit full adder, and one 4x1 MUX to build a function block that implements the following ALU:
F = A +1
F = A -1
F = A + B
F = A - B
Determine the number of selection bits needed.
Complete the function selection truth table.
Draw the circuit.

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