Which of the Following Is (Are) True About Time Fences

Multiple Choice

Which of the following is (are) true about time fences in a master production schedule system?
I. Changes far out in the planning horizon can be made with little or no cost to manufacturing.
II. In the "frozen zone," capacity and materials are committed to specific orders.
III. Changes in the near future on the planning horizon are less costly to make than changes far out.

A) I and II only
B) II and III only
C) I and III only
D) I, II, and III
E) none of the above