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Which of the following is true? Period Costs are inventoried when incurred. All the statements are true. Supervisors' salaries are considered part of factory overhead.. O Cost of goods sold is an inventory account. Under a just-in-time inventory system, management strives to O None of the answers are correct. o carry substantial levels of inventory. o minimize levels of all inventory. items. O Two of the answers are correct. o have inventory available when it is needed