A polystrene material has a resistivity to the impurity $($pi$)$ of $2\mathrm{.}5*10^-5$ ohm m$,$ to the plastic deformation $($pd$)$ of $3\mathrm{.}5*10^-6$ ohm m and a total $($pt$)$ of $4\mathrm{.}0*10^-5$ ohm m$.$

Calculate its total resistivity $($ohm mm$)$ at $1173\backslash$Kappa $.$

$2\mathrm{.}0*10^-5$

$1\mathrm{.}2*10^-5$

$1\mathrm{.}2*10^-2$

$3\mathrm{.}5*10^-6$