Consider the following linear programming problem:

MIN

$Z=10x_1+20x_2$

s$.$t$.$

$x_{1}9$

$x_{2}3$

$x_1,x_{2}0$

Please choose the best combination of $x_1$ and $x_2(x_1,x_2)$ of this problem $-$ the optimal solution point $($the one that return the minimum $Z)?$

$(9,3)$

$(0,3)$

$(0,0)$

$(9,0)$

None of the above