For what range(s), if any, of the adjustable constant \(\mathrm{K}\), are all the roots of following polynomials in the left half of the complex plane ?

(a) \(s^{4}+s^{3}+3 s^{2}+2 s+4+\mathrm{K}\)

(b) \(s^{3}+\mathrm{Ks}^{2}+2 \mathrm{~K} s+\mathrm{K}\)