2.7-3. Find the inverse z-transform of each E(2) below by the four methods given in the text. Compare the values of e(z), for k = 0, 1, 2, and 3, obtained by the four methods. 0.5 (a) E(z) = (b) E(z) = (z - 1)(z -0.8) (2-1)(z -0.8) 0.5(z+1) (c) E(z) = 2(2-1) (d) E(z) = (z 1)(z 0.8) (z 1)(z 0.8)