Note: Cells B$3$ and C$3$ are the designated cells for the optimal values of $x_1$ and $x_2,$ respectively, while cell E$4$ is the designated cell for the objective function value. Cells D$8$:D$10$ designate the left$-$hand side of the constraints.

Refer to Figure $1.$ Which cell$($s$)$ are the Changing Cells as designated by "Solver"?

B$5$:C$5$

D$8$:D$10$

B$3$:$3$

$B2$:$C2$

E$4$