Orangetree Pharma's demand for test tubes is 72,000 units. If the lead time for placing an order is 5 days, then an order should be placed at an inventory level of: (Assume 360 days in a year)

	a.	2,500 units.
	b.	800 units.
	c.	1,250 units.
	d.	625 units.
	e.	1,000 units.