Goal programming solution feedback indicates that the o$,$ level of $50$ should not be exceeded in future solution iterations. How should the goal constraint be modified to accommodate this requirement?

$40x120x2u_4-o_4=300$

Increase the RHS value from $300$ to $350.$

Replace the constraint with $401202350.$

Do not modify the constraint; add the constraint $o_{4}50.$

Do not modify the constraint; add the constraint $o_4=50.$