Rationale: A. The inner cannula is a removable tube inside the tracheostomy tube that allows for easier cleaning and maintenance of airway patency. It does not assist in inserting the tracheostomy tube itself. B. The cuff is an inflatable balloon around the tracheostomy tube that seals the airway to prevent aspiration and ensure proper ventilation. It does not facilitate insertion of the tube. C. The obturator is a smooth, rounded guide that fits inside the tracheostomy tube during insertion. It helps direct the tube into the trachea, reducing trauma to surrounding tissues and making the insertion process easier and safer. Once the tube is in place, the obturator is removed. D. The neck plate (flange) is the part of the tracheostomy tube that rests against the neck and is secured with ties or straps. It stabilizes the tube after placement but does not assist with insertion.