Design a multi-function unit with 4 functions chosen using select inputs s1s0. The unit has two 2-bit inputs (A = a1,a0 and B = b1,b0) and 4-bit output (z3,z2,z1,z0). The unit performs A+B (s1s0 = 00), AB (s1s0 = 01), A2+B (s1s0 = 10) and A+B2 (s1s0 = 11). Draw the final design clearly