To Verify the Correct Placement of an Endotracheal Tube (ET)

To verify the correct placement of an endotracheal tube (ET) after insertion, the best initial action for the nurse to take is

A) use an end-tidal CO₂ monitor to check for placement in the trachea.
B) auscultate for the presence of bilateral breath sounds.
C) obtain a portable chest radiograph to check tube placement.
D) observe the chest for symmetrical movement with ventilation.