The nurse is caring for a client in labor. Which action should the nurse take first if a late deceleration of the fetal heart rate is noted?

Administer oxygen via a non-rebreather mask.

Turn the client to a side-lying position.

Discontinue oxytocin infusion if in use.

Administer an intravenous fluid bolus.

Administer 0.2 mg methylergonovine subcutaneously.