For the audit of a non-public company, which of the following statements best explains why an auditor would use only substantive test procedures and would not perform any internal control testing in order to evaluate management assertions about an account? The relevant internal control components are not well documented: The internal auditor already has tested the relevant controls and found them effective. Testing the effectiveness of the internal controls would cost more than the cost savings from the reduction in substantive tests. The cost of substantive procedures will exceed the cost of testing the relevant controls