In a review of an electronic data interchange application using a third-party service provider, the auditor should:
I. Ensure encryption keys meet International Organization for Standardization (ISO) standards.
II. Determine whether an independent review of the service provider's operation has been conducted.
III. Verify that only public-switched data networks are used by the service provider.
IV. Verify that the service provider's contracts include necessary clauses, such as the right to audit.