$($c$)$ A discrete$-$time LTI system has the system transfer function

$H(z)=\frac{z-0\mathrm{.}4}{z^3-1\mathrm{.}4z^2+0\mathrm{.}85z}$

i$)$ Draw a zero$-$pole plot of the system; $(2\text{'})$

ii$)$ Roughly sketch the magnitude plot of the system response, specify the magnitudes at $=0,\frac{}{6},\frac{}{4}$ and $$ respectively; determine if the system has a lowpass, highpass, bandpass or bandstop characteristic; $(4\text{'})$

iii$)$ Assume the system is consisting of two LTI systems connected in cascade, i$.$e$.,H(z)=H_1(z)H_2(z),$ draw a block diagram of the system. $(4\text{'})$