Based on the evidence collected and evaluated, an auditor decides to increase the risk of control above that preliminarily planned. In this case, if the auditor wants to have an audit risk[acceptable audit risk level)that is equal to what was originally planned, then he must (everything else equal): a. increase levels of substantiality. b. decrease audit tests(substantive testing). C. decrease the risk of detection(planned detection risk) d. increase the inherent risk