Read the passage below and solve the questions based on it.
ABC is a firm that deals with furniture. Manufacturing of a table requires three levels of assembly. The finished table is at the first level. The leg assembly and the tabletop are at the second level. The pieces that go into the leg assembly are at the third level which consist of shortrails, longrails and legs. One unit of the table requires one unit of the tabletop and one unit of the leg assembly. One unit of the leg assembly requires 2 units of shortrails, 2 units of longrails and 4 units of legs. The orders are placed just in time to minimize storage.
The lead time for activities are (Lead time is the waiting time required to complete one activity):
The availability of the parts at the present time:
Demand of the finished tables:
The supplier of longrails has shifted its manufacturing units to a new location and owing to this, the delivery time of the long rail has been increased by 1 week. When should the order of longrails be placed to meet the week 5 demand of the finished table?