Audit Accounting

A CPA is performing an audit of a client's financial statements for the year ended 12/31/18. The Company has significant inventories on hand. What is the key procedure that the Statements on Auditing Standards require the CPA to do re: the inventories? There is a presumption that the auditor will request the confirmation of accounts receivable during an audit unless one of three criteria are met; name 1 of these 3 criteria