A company is developing a linear programming model for its aggregate production plan. If Wt $=$ workforce size for period t$,$ Ht $=$ number of workers hired for period t$,$ and Ft $=$ number of workers fired for period t$,$ then the company's workforce constraint for period $4$ is

Group of answer choices

W$4=$ W$3-$ H$4+$ F$4$

W$4=$ W$3+$ H$4-$ F$4$

W$4=$ W$3+$ H$3-$ F$3$

W$4=$ W$3+$ H$4$