QUESTION $2$

minz$=2x_1+3x_2$

$s.t.0\mathrm{.}5x_1+0\mathrm{.}25x_{2}6$

$x_1+3x_{2}20$

$x_1+x_2=10$

$x_1,x_{2}0$

Which of the following is the model that could be used to solve the LP model above using the Big$-$M method?