The following is a true statement about safety stock: A. Based on statistics, a firm can never be 100% confident that they will have enough inventory to meet future demand. B. Safety stock only applies to dependent demand inventory, never independent demand inventory. C. Based on statistics, a firm can always be 100% confident that they will have enough inventory to meet future demand. D. Safety stock is only utilized when there is an unusual event that occurs, such as a hurricane or machine failure. E. Safety stock only applies to independent demand inventory, never dependent demand inventory