A client with lung cancer has developed an intractable, nonproductive cough that is unrelieved by nonopioid antitussive agents. The physician orders codeine, 10 mg P. O. every 4 hours. Which statement accurately describes codeine?A. It's a centrally acting antitussive and doesn't cause dependence. B. It's a peripherally acting antitussive and doesn't cause dependence. C. It's a centrally acting antitussive and can cause dependence. D. It's a peripherally acting antitussive and can cause dependence.