When Done Properly, the Implementation of Just in Time (JIT)philosophy

When done properly, the implementation of Just in time (JIT) philosophy increases the company's performance.Choose the effects that do not contribute to this phenomenon.
1) Increases supplier dependency
2) Reduces the need for information sharing
3) Increases WIP Inventory levels
4) Reduces process variability

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