In the feed production planning example from Unit $5\mathrm{.}4,$ we had to solve for the optimal production plan for $6$ months. Each month had a maximum production capacity and a delivery requirement. In particular, delivery requirement for month $4$ was $24$ tons, whereas the production capacity for that month was $20.$ What is the correct way to write the production capacity constraint for month $4?$

Question $11$ options:

X$14+$ X$24+$ X$34+$ X$44=24$

X$44=20$

X$44+$ X$45+$ X$46<=20$

X$14+$ X$24+$ X$34+$ X$44-$ X$43-$ X$53-$ X$63=0$