Which of the Following Is the Best Definition of Inventory

Which of the following is the best definition of inventory period?

A) The time between cash disbursement and cash collection.
B) Graphical representation of the operating cycle and the cash cycle.
C) A promise by the firm, included in the debt contract, to perform certain acts. A restrictive covenant imposes constraints on the firm to protect the interests of the debtholder.
D) A secured short-term loan to purchase inventory.
E) The time it takes to acquire and sell inventory.