Let sequence x_n=delta_{n-5), where delta_n is the impulse signal. Find its Z-transform. A 0 B 1 C Z'5 D Z~{-5}Let sequence x_n=u_{n+5), where u_n is the step signal. Find its Z-transform A 1 B 1/(1-Z~{-1}) C Z15/(1-Z~{-1}) D Z1{-5}/(1-21{-1})