Final answer:
The nurse manager is using strategies A) Presenting the ground rules and C) Focusing on solutions during the conflict negotiation process. These are part of effective conflict resolution techniques aimed at resolving the staffing policy conflict while maintaining workplace harmony.
Step-by-step explanation:
During the conflict negotiation process, the nurse manager is employing strategy A) Presenting the ground rules by instructing the nurses to respect each other's opinions. Setting such ground rules helps frame the meeting in a manner that encourages constructive dialogue. Additionally, the manager appears to be using strategy C) Focusing on solutions by indirectly suggesting that the discussion aims toward resolving the conflict about the unit's float policy. Therefore, the correct answer to which strategies the nurse manager is using during the conflict negotiation process would be D) A and C. These strategies are part of effective conflict resolution techniques that promote a positive working relationship, by addressing conflicts in a way that allows all involved to feel heard and supported.