Oxygen at 5 L/minute per nasal cannula is being administered to a 10-year-old child with pneumonia. When planning care for this child, which principle of oxygen administration should the nurse consider?

Oxygen is less toxic when it is humidified with a hydration source.

Avoid administration of oxygen at high levels for extended periods.

Increase oxygen rate during sleep to compensate for slower respiratory rate.

Taking a sedative at bedtime slows respiratory rate, which decreases oxygen needs.