Which of the following ventilatory techniques is likely to yield the LOWEST tidal volumes?

With both mouth-to-mouth and mouth-to-mask ventilation, it is relatively easy to maintain a good seal with the patient's mouth, allowing for delivery of adequate tidal volumes. Likewise, two person bag-valve-mask techniques dedicate one rescuer solely to ensuring adequate mask seal and the second rescuer to squeeze the ventilation bag with two hands (again allowing for adequate tidal volumes to be delivered). One person bag-valve-mask usage is a difficult technique to master, as the single rescuer must maintain a manual airway maneuver, an adequate mask seal, and squeeze the bag simultaneously.