Determine the output in z-domain for the following systems when a step input is applied through a sampler:
i. \(\quad G(s)=\frac{1}{(s+4)}\)

ii. \(G(s)=\frac{1}{(s+3)^{2}}\)

iii. \(G(s)=\frac{1}{\left(2 s^{2}+5ight)}\)

iv. \(G(s)=\frac{1}{\left(s^{2}+2 s+5ight)}\)