Given the following continuous-time system in s- domain with a unit-step input signal: Y(s)/U(s) = (bs+13)(s + 4s +13) a) (10 Points) Use ZOH technique to find the corresponding z-transfer function in terms of the constant (b) in standard form. b) (10 Points) Find y(k) vs. k analytically in terms of the constant (b) due to a unit step sequence.