Sketch the root locus for the closed-loop systems with forward-path transfer function given below. Just do a quick sketch, no need to calculate break-in/break-out point(s) or exact imaginary axis crossing point.(a)G(s) =K(s+ 2)(s+ 6)s2+ 8s+ 25(b)G(s) =K(s2+ 4)s2+ 1(c)G(s) =K(s2+ 1)s2(d)G(s) =K(s+ 1)3(s+ 4)