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The situation described involves a nurse's responsibility to maintain accurate and complete patient records. When focusing on the concept of breach of duty, it is crucial to understand that nurses are held to a standard of care that includes thorough documentation as part of their professional responsibilities. Failing to document the care provided to one patient out of five can indicate that the nurse did not meet the expected standard of practice.

Breach of duty occurs when a nurse fails to uphold their professional responsibilities, which can include inadequate documentation that leads to potential harm to the patient or omits critical information necessary for ongoing care. In this context, the nurse’s failure to document not only impacts the patient's immediate treatment but can also affect legal and ethical considerations in the healthcare setting.

While malpractice relates to a broader scope involving negligence leading to patient harm, and nonmaleficence pertains to the obligation to do no harm, the specific failure to document ties directly into the notion of breaching the duty of care owed to patients. Proper documentation is essential for ensuring continuity of care and protecting patient safety, making this the most relevant legal principle in the context provided.