consider the following two first-order transfer functions H1 (z) = z + b/z + a , a = 0.3, b = - 0.4 H2(z) = bz + 1/z + a , a = 0.3, b = - 0.4 (a) draw the pole-zero plot for both transfer function H1(z) and H2(z) (b) is H1(z) a minimum-phase transfer function? and why? (c) is H2(z) a minimum-phase transfer function? and why?