A nurse is reviewing a provider's prescription that reads: "Administer morphine sulfate 2 mg IV q4h PRN for pain." Which interpretation of the abbreviations demonstrates correct understanding?

Administer 2 mg of morphine sulfate intravenously every 4 hours as needed for pain

Administer 2 mg of morphine sulfate by mouth every 4 hours as needed for pain

Administer 2 mg of morphine sulfate intravenously every 4 hours without regard to pain

Administer 2 mg of morphine sulfate intramuscularly every 4 hours as needed for pain