66. Demultiplexer

How do you plan to solve it?

module demux1to4(d,s,y);
input d;
input [1:0] s;
output [3:0]y;
assign y[0] = ~s[1] & ~s[0] & d;
assign y[1] = ~s[1] & s[0] & d;
assign y[2] = s[1] & ~s[0] & d;
assign y[3] = s[1] & s[0] & d;
endmodule