$3\mathrm{.}2$ Simplify the following Boolean functions, using three$-$variable K$-$maps:

$($c$)F(x,y,z)=(2,3,4,5)$

$($d$)F(x,y,z)=(1,2,3,5,6,7)$

$3\mathrm{.}7$ Simplify the following Boolean expressions, using four$-$variable K$-$maps:

$($b$)A{D}^{\text{'}}+B^{\text{'}}{C}^{\text{'}}D+BC{D}^{\text{'}}+B{C}^{\text{'}}D$