The chief nursing officer (CNO) recognizes a large increase in turnover on a given unit. The nurse manager of the unit says that this is just a coincidence and that the unit is "fine." What action by the CNO is appropriate? 1. Talk to current nursing staff and review the exit interviews of those who have left. 2. Call the unit supervisor and inquire as to why the turnover rate is high. 3. Discuss the matter with other nurse managers. 4. Discuss the matter with the hospital chief administrator