Which Nursing Intervention Ensures an Accurate Cardiac Output Reading for a Patient

Which nursing intervention ensures an accurate cardiac output reading for a patient?

A) Administer the injectate within 4 seconds.
B) Use 5 cc of iced saline as the injectate.
C) Ensure that there is a difference of 10°C between the injectate temperature and the patient's body temperature.
D) Inject the fluid into the pulmonary artery distal port.