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A manufacturing company gets an order for an item that is due to arrive in six days. You know it will take one day to deliver the item and three days to manufacture and assemble it$.$ That means your lead time for the project is four days and you must commence work on the item on day two $-$ and not a moment sconer. Which scheduling method is used?

a$.$ EDD

b$.$ Forward

c LPT

d$.$ Backward

e$.$ SPT