Write a module mean4.sv, which finds the average of four inputs. A stub module and test bench has been provided. The interface for your module should be:

//mean4.sv module mean4 (

input logic [7:0] A,

input logic [7:0] B,

input logic [7:0] C,

input logic [7:0] D,

output logic [7:0] Z );

endmodule