A client in a postpartum unit complains of sudden sharp chest pain and dyspnea. The nurse notes that the client is tachycardic and the respiratory rate is elevated. The nurse suspects a pulmonary embolism

A client in a postpartum unit complains of sudden sharp chest pain and dyspnea. The nurse notes that the client is tachycardic and the respiratory rate is elevated. The nurse suspects a pulmonary embolism. Which of the following would be the initial nursing action?
a) Initiate an intravenous line.
b) Assess the client's blood pressure.
c) Prepare to administer morphine sulfate.
d) Administer oxygen, 8 to 10 L/min, by face mask.