In Production Scheduling LP Problems, Inventory at the End of This

Multiple Choice

In production scheduling LP problems, inventory at the end of this month is set equal to

A) inventory at the end of last month + this month's production - this month's sales.
B) inventory at the beginning of last month + this month's production - this month's sales.
C) inventory at the end of last month + last month's production - this month's sales.
D) inventory at the beginning of last month + last month's production - last month's sales.