1. Develop a Verilog model for a 4-bit barrel shifter, which produces a 4-bit output that performs "Rotate Shift Left" or "Circular Shift Left". The 4-bit input vector shall be named 1(3:0), the number of bit positions to shift is SH[1:0), and the output is [3:0). Note that a barrel shifter (or rotate/circular shift operation) shifts any MSbits back around to the LSbit position. For example, if I[3:0]=4'b0111 and SH[1:0)=3, then [3:0]=4'b1011. module BSHIFT (input (3:0) 1, input (1:0) SH, output [3:0] O)