show me the steps to solve : $6\mathrm{.}2($a$)$ A transistor with parameters $=120$ and VA $=120$ V is biased at a collector current of IC Q $=0\mathrm{.}80$ mA$.$ Determine the values of gm $,$ r $,$ and ro$.($b$)$ Repeat part $($a$)$ for IC Q $=80$A