Based on the previous circuit, draw the wiring diagram of a 4-bit incrementer/decrementer circuit, taking as input a 4-bit signed integer A = a3a2a1a0 and a 1-bit direction input D, and providing as output a signed integer X = x3x2x1x0, such that X = (A+1) if D = 0, and X = (A−1) if D = 1 (there will be no handling of potential overflows).