Which legal doctrine cannot apply to a nurse's practice as a private duty nurse?

Question

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Rationale 1: Res ipsa loquitur, as presented in a previous chapter, means "the thing speaks for itself." This doctrine could be applied to a situation involving a private duty nurse.
Rationale 2: Private duty nurses can be charged with negligence.
Rationale 3: Private duty nurses can have personal liability in provision of patient care.
Rationale 4: Private duty nurses are employed by individuals to give care. The doctrine of respondeat superior implies that the employer is responsible for the nurse's actions. It is illogical to view the patient as responsible for his or her nurse's actions as an employee.

Which Legal Doctrine Cannot Apply to a Nurse's Practice as a Private