Based on Inventory System analysis, to ensure that inventory stock is kept at a certain level, each store should "check stock by hand."
This is because checking stock by hand allows the business to manually measure all the inventory that firm currently has at that given time. This method measures the amount of inventory that remains.
By checking stock by hand, the business firms can quickly determine the levels of inventory that need to be maintained, the time stock should be replenished, and how large orders should be.
Hence, in this case, it is concluded that the correct answer is "check stock by hand."
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