Final answer:
To legally ensure that care is not negligent, the nurse should focus on documenting the nursing actions in the client's record.
Step-by-step explanation:
To legally ensure that care is not negligent, the nurse should primarily focus on documenting the nursing actions in the client's record (option C). This is important because it provides a written record of the care provided, which can serve as evidence of the nurse's diligence and adherence to nursing standards. While options A, B, and D can be helpful in certain situations, they do not replace the importance of proper documentation in ensuring non-negligent care.