The healthcare provider gives a verbal prescription for 2 mg of intravenous morphine to be given to a client every 4 hours as needed for severe pain. How should the nurse document the prescription?

C IV MS 2 mg every 4 hr as needed for severe pain. A Morphine 2.0 mg IV every four hours for severe pain. B Morphine 2 mg IV every 4 hr PRN for severe pain. D IV MS 2.0 mg every 4 hours PRN for severe pain.