Internal Control Activities Within the Purchasing Process, Identified as Adequate

Internal control activities within the purchasing process, identified as adequate records and documents, would include which of the following?

A) Files are to be maintained for purchase requisitions, purchase orders, receiving reports, and invoices.
B) Periodic physical inventory counts are to be reconciled with the inventory ledger.
C) Companies are to implement controls where the corresponding benefit exceeds the related cost.
D) Avoid having the same individuals who handle the inventory also have access to the related accounting records.