A 10-year-old child with pneumonia is receiving oxygen at 5 L/minute via a nasal cannula. When planning care for this child, what principle of oxygen administration should the nurse keep in mind?

Avoid administering oxygen at high levels for extended periods.

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

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

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