Among the Following Choices, Select the Disadvantages to Using a Pure

Among the following choices, select the disadvantages to using a pure level strategy for aggregate planning
1) High level of excess inventory
2) Incurring subcontracting or overtime costs
3) High cost associated with changing production capacity
4) Incurring Backorder costs

A) (1)
B) (1) and (2)
C) (3) and (4)
D) (1) , (2) , and (4)