When must planned order release(s) take place for material requirements planning (MRP) data given below? Quantity = 60; Lead Time = 3 weeks.
Period (week) 1 2 3 4 5
Requirements 80 -- 90 -- 90
Scheduled Receipts 60
Projected Stock balance 190
Planned Order Release
A - Week 1
B - Week 2
C - Week 3
D - Week 4